About MathU RPN Calc
MathU RPN is an advanced scientific and financial calculator designed in the spirit of classic HP calculators. MathU RPN is based on the Reverse Polish Notation (RPN) entry system and combines more than 96 functions to...
MathU RPN is an advanced scientific and financial calculator designed in the spirit of classic HP calculators. MathU RPN is based on the Reverse Polish Notation (RPN) entry system and combines more than 96 functions to create a calculator that meets the needs of professionals who use a calculator every day. First released in 2008, the calculator continues to be updated with new features as iOS improves. MathU RPN works on the iPhone, iPad and macOS. On the iPad, MathU RPN maintains its orientation as the iPad is turned and you can rotate it from portrait to landscape keypad layout via the Rotate button. When the iPad has a hardware keyboard attached, you can type of the names of the buttons the keyboard to execute them -- thus avoiding having to press the calculator keys with your finger. On the iPhone, you can lock it to always use the portrait or landscape keypad or let it switch orientations automatically when you rotate your phone. MathU RPN is an excellent financial calculator. There are functions for computing mortgage amortization and cash flow computations like IRR and NPV, as well as functions for working with dates. Many of the existing financial functions have been extended to handle odd periods (conforming to the same conventions as the HP-12C). In addition, on tall devices (like most iPhones), the financial registers are displayed on the keypad. MathU RPN is also a programmer's calculator. The A-F keys are available right up front for easy entry in HEX mode and there are many functions for working with integers. Dr. Clay M. Thompson of Creative Creek has harnessed the computational power of the iPhone to produce an accurate and high performance calculator. General Features - IEEE double precision accuracy (16 digits) - High performance fast computations - 20 storage registers - 5 financial registers - 16 high stack (switchable to 4) - Supports international number separators - Switch between portrait and landscape keypads - Quick access to the preference and on-line manual - Stack and Register view (accessible via [RCL][RCL] Scientific Features - Full set of trigonometric functions - Full set of logarithmic and power functions - Statistics functions - Polar and rectangular conversions - Repeated computations Mortgage and Loan Features - Time value of Money functions - Compute mortgage and loan terms - Solve for payments and interest rates - Solve for IRR and NPV - Date functions Computer Science Features - Number bases (HEX, OCT, DEC, BIN) - Bitwise logical operations - Masking and shifting functions - Support for a wordsizes up to 48 bits - Modular arithmetic MathU 4.1 supports iOS 16.6 or higher as well as macOS. For more info (including the users manual) go to http://www.creativecreek.com or use the built-in quick reference.
Version History We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. The 4.1.4 release fixes a minor layout bug I found after the previous release. Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. 4.1.4 May 15 We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. The 4.1.3 release fixes a few minor bugs I found after I released 4.1.0. Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. 4.1.3 Feb 23 We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. The 4.1.2 release fixes a few minor bugs I found after I released the last version. Enjoy! Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. 4.1.2 Feb 15 We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. All the calculator functions work. Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. 4.1.0 Jan 26 MathU RPN 4.0.2 adds: - support for bluetooth keyboard so you can "press" buttons by typing the name of the key on the calculator - support for iOS 16.x and iOS 17.x - bug fix for copy & paste feature that wasn't working with MathU RPN 4.0.0 - bug fix for random crashes MathU RPN also runs on macOS with Silicon! 4.0.2 11/20/2023 MathU RPN 4.0.1 adds: - support for bluetooth keyboard so you can "press" buttons by typing the name of the key on the calculator - support for iOS 16.x and iOS 17.x - bug fix for copy & paste feature that wasn't working with MathU RPN 4.0.0 MathU RPN also runs on macOS with Silicon! 4.0.1 11/11/2023 MathU 4.0.0 adds - support for a bluetooth keyboard so you can "press" buttons by typing the name of the key on the calculator. - support for iOS 16.x and iOS 17.x. MathU 4.0.0 also runs on macOS with Apple Silicon! 4.0.0 10/24/2023 MathU RPN 3.2.2 adds support for iOS multitasking, iPad split screen and iOS 14 as well a supporting a 2X larger keypad on iPad. This update is recommended for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. New for the 3.2.2 update is improved built-in documentation, the ability to turn the stack labels (X: and Y:) on/off, improved support for Dark Mode, fixes for iOS 10.x through 13.x, and other bug fixes (including an issue when using the France region's number separators). 3.2.2 09/25/2020 MathU RPN 3.2.1 adds support for iOS multitasking, iPad split screen and iOS 13 as well a supporting a 2X larger keypad on iPad. This update is recommended for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. New for the 3.2.1 update is improved built-in documentation, the ability to turn the stack labels (X: and Y:) on/off, improved support for Dark Mode, bug fixes for iOS 10.x through 12.x, and other bug fixes. 3.2.1 08/23/2020 MathU RPN 3.2 adds support for iOS multitasking, iPad split screen and iOS 13 as well a supporting a 2X larger keypad on iPad. This update is recommended for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. New for the 3.2 update is improved built-in documentation, the ability to turn the stack labels (X: and Y:) on/off, improved support for Dark Mode, and bug fixes. 3.2 08/20/2020 MathU RPN 3.1 adds support for iOS multitasking, split screen and iOS 13 as well a supporting a 2X larger keypad on iPad. This update is recommeneded for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. 3.1 07/01/2020 Compatibility release for iOS 11.x. Fixes a few issues in the 3.0.3 release. 3.0.4 11/30/2017 MathU RPN is an advanced scientific and fiancial calculator designed in the spirit of classic HP calculators. New in MathU RPN 3.0.3: Compatibility release for iOS 11.0 MathU 3.0.3 supports iPhone or iPad running iOS 8.0 or higher. 3.0.3 11/21/2017 New in MathU RPN 3.0 are: o A two or four line display option so you can see more of the stack. o Visible financial registers o Support for iPhone 5, iPhone 6, iPhone 6 Plus. o New iPad interface that maintains its orientation during device rotation. o New stack and register display accessible via [RCL] [RCL] o Bug fix for issues on iOS 8. o Bug fix (v3.0.2) to remove X: label from the portrait display on iPhone 3 and iPhone 4. MathU RPN 3.0 supports iOS 5.1.1 or higher (including iOS 8). 3.0.2 12/31/2014 New in MathU RPN 3.0 are: o A two or four line display option so you can see more of the stack. o Visible financial registers o Support for iPhone 5, iPhone 6, iPhone 6 Plus. o New iPad interface that maintains its orientation during device rotation. o New stack and register display accessible via [RCL] [RCL] o Bug fix for issues on iOS 8. MathU RPN 3.0 supports iOS 5.1.1 or higher (including iOS 8). 3.0.1 11/06/2014 New in MathU 3.0 are: o A two or four line display option so you can see more of the stack. o Visible financial registers o Support for iPhone 5, iPhone 6, iPhone 6 Plus. o New iPad interface that maintains its orientation during device rotation. o New stack and register display accessible via [RCL] [RCL] o Bug fix for issues on iOS 8. MathU 3.0 supports iOS 5.1.1 or higher (including iOS 8). 3.0.0 11/04/2014 MathU RPN 2.2.2 is a bug fix release: - A bug was fixed that caused the wrong Y register value to display after a CLX (when "Show More Stack" is on) - A bug was fixed in the DATE function that affected results near the first day of the month. - A bug was fixed where the settings were not saved when terminated via the multi-tasking panel. 2.2.2 09/30/2010 Fix bug in DATE function 2.2.1 07/13/2010 MathU RPN 2.2 adds the following features: - Compatibility with iOS 4 and iPhone 4 - Add a preference to lock the orientation of the calculator (portrait or landscape) - High resolution keypad for the retina display on iPhone 4 - Support for multitasking under iOS 4 2.2 07/01/2010 MathU RPN 2.1 adds support for copy and paste. Double tap the displayed number to copy or paste it. The update also includes a bug fix for the AMORT function when computing amortization from the perspective of the bank. MathU RPN 2.1 requires iPhone OS 3.0 or higher. 2.1 05/19/2010 MathU RPN 2.0 contains many major improvements to the calculator. Eighteen new functions have been added, some of the existing functions have been made more accessible and the display has been improved. The update makes MathU RPN 2.0 a better programmer's calculator. The A-F keys are available right up front for easy entry in HEX mode and seven new functions for working with integers have been added. MathU RPN 2.0 is also a better financial calculator. There are new functions for computing mortgage amortization and cash flow computations like IRR and NPV, as well as functions for working with dates. Many of the existing financial functions have been extended to handle odd periods (conforming to the same conventions as the HP-12C). The scientific side of MathU RPN has also been improved by adding functions for linear regression as well as computing the percent of total. In particular, improvements in this update include: o A two line display option so you can see more of the stack. o Date functions to compute the day of the week, days between dates, and a date in the future. o Linear regression functions to compute an estimated y or x value along a fitted line. o Bit manipulation functions to shift, mask and compute the number of bits in the integer representation of a number. o Direct access to A-F in HEX mode for easy number entry. The A-F keys replace the financial functions on the keypad when a non-decimal number base is being used. o Improved display of HEX, OCT, BIN numbers with bit position subscripts for easy interpretation. Very long binary numbers wrap over two lines when they get too big. o Direct access to storage registers 10-19 via the STO .0 through STO .9. o Extensions to the financial functions to handle odd period calculations. MathU RPN now conforms to the same conventions as those used on the HP-12C. o An extension to the random number function RAND to compute random integers when the calculator is in HEX, OCT or BIN mode. In decimal DEC mode, RAND generates a random real value between 0.0 and 1.0. o A new preference to choose between a single line display or the two line display (Show More Stack) and a preference to choose the date format (M.DY vs D.MY). o [Bug fix] Word size setting in the preferences now supports the full 48 bits. 2.0 01/14/2010 Improvements in MathU RPN 1.2: - Support storage register arithmetic with financial functions (STO + PMT) - Use anti-aliased fonts for button and function labels - Reposition shift buttons in landscape mode to make them easier to use - Seed RAND function with current time so that the sequence of numbers is always different - Extend factorial function (n!) to compute the Gamma function for non-integer values - Give user the choice between opening the documentation or the preferences when the (i) is tapped 1.2 02/20/2009 1.1.2 11/16/2008 1.1.1 11/01/2008 1.0.0 10/17/2008
Previous Versions
Here you can find the changelog of MathU RPN Calc since it was posted on our website on 2016-10-18 08:33:50.
The latest version is 4.1.4 and it was updated on 2026-10-18 04:10:54. See below the changes in each version.
MathU RPN Calc version 4.1.4
Updated At: 2026-10-15
Changes: Version History We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. The 4.1.4 release fixes a minor layout bug I found after the previous release.
Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. 4.1.4 May 15 We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. The 4.1.3 release fixes a few minor bugs I found after I released 4.1.0.
Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. 4.1.3 Feb 23 We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. The 4.1.2 release fixes a few minor bugs I found after I released the last version. Enjoy!
Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. 4.1.2 Feb 15 We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS.
All the calculator functions work.
Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad. 4.1.0 Jan 26 MathU RPN 4.0.2 adds:
- support for bluetooth keyboard so you can "press" buttons by typing the name of the key on the calculator
- support for iOS 16.x and iOS 17.x
- bug fix for copy & paste feature that wasn't working with MathU RPN 4.0.0
- bug fix for random crashes
MathU RPN also runs on macOS with Silicon! 4.0.2 11/20/2023 MathU RPN 4.0.1 adds:
- support for bluetooth keyboard so you can "press" buttons by typing the name of the key on the calculator
- support for iOS 16.x and iOS 17.x
- bug fix for copy & paste feature that wasn't working with MathU RPN 4.0.0
MathU RPN also runs on macOS with Silicon! 4.0.1 11/11/2023 MathU 4.0.0 adds
- support for a bluetooth keyboard so you can "press" buttons by typing the name of the key on the calculator.
- support for iOS 16.x and iOS 17.x.
MathU 4.0.0 also runs on macOS with Apple Silicon! 4.0.0 10/24/2023 MathU RPN 3.2.2 adds support for iOS multitasking, iPad split screen and iOS 14 as well a supporting a 2X larger keypad on iPad. This update is recommended for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. New for the 3.2.2 update is improved built-in documentation, the ability to turn the stack labels (X: and Y:) on/off, improved support for Dark Mode, fixes for iOS 10.x through 13.x, and other bug fixes (including an issue when using the France region's number separators). 3.2.2 09/25/2020 MathU RPN 3.2.1 adds support for iOS multitasking, iPad split screen and iOS 13 as well a supporting a 2X larger keypad on iPad. This update is recommended for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. New for the 3.2.1 update is improved built-in documentation, the ability to turn the stack labels (X: and Y:) on/off, improved support for Dark Mode, bug fixes for iOS 10.x through 12.x, and other bug fixes. 3.2.1 08/23/2020 MathU RPN 3.2 adds support for iOS multitasking, iPad split screen and iOS 13 as well a supporting a 2X larger keypad on iPad. This update is recommended for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. New for the 3.2 update is improved built-in documentation, the ability to turn the stack labels (X: and Y:) on/off, improved support for Dark Mode, and bug fixes. 3.2 08/20/2020 MathU RPN 3.1 adds support for iOS multitasking, split screen and iOS 13 as well a supporting a 2X larger keypad on iPad. This update is recommeneded for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. 3.1 07/01/2020 Compatibility release for iOS 11.x. Fixes a few issues in the 3.0.3 release. 3.0.4 11/30/2017 MathU RPN is an advanced scientific and fiancial calculator designed in the spirit of classic HP calculators.
New in MathU RPN 3.0.3: Compatibility release for iOS 11.0
MathU 3.0.3 supports iPhone or iPad running iOS 8.0 or higher. 3.0.3 11/21/2017 New in MathU RPN 3.0 are:
o A two or four line display option so you can see more of the stack.
o Visible financial registers
o Support for iPhone 5, iPhone 6, iPhone 6 Plus.
o New iPad interface that maintains its orientation during device rotation.
o New stack and register display accessible via [RCL] [RCL]
o Bug fix for issues on iOS 8.
o Bug fix (v3.0.2) to remove X: label from the portrait display on iPhone 3 and iPhone 4.
MathU RPN 3.0 supports iOS 5.1.1 or higher (including iOS 8). 3.0.2 12/31/2014 New in MathU RPN 3.0 are:
o A two or four line display option so you can see more of the stack.
o Visible financial registers
o Support for iPhone 5, iPhone 6, iPhone 6 Plus.
o New iPad interface that maintains its orientation during device rotation.
o New stack and register display accessible via [RCL] [RCL]
o Bug fix for issues on iOS 8.
MathU RPN 3.0 supports iOS 5.1.1 or higher (including iOS 8). 3.0.1 11/06/2014 New in MathU 3.0 are:
o A two or four line display option so you can see more of the stack.
o Visible financial registers
o Support for iPhone 5, iPhone 6, iPhone 6 Plus.
o New iPad interface that maintains its orientation during device rotation.
o New stack and register display accessible via [RCL] [RCL]
o Bug fix for issues on iOS 8.
MathU 3.0 supports iOS 5.1.1 or higher (including iOS 8). 3.0.0 11/04/2014 MathU RPN 2.2.2 is a bug fix release:
- A bug was fixed that caused the wrong Y register value to display after a CLX (when "Show More Stack" is on)
- A bug was fixed in the DATE function that affected results near the first day of the month.
- A bug was fixed where the settings were not saved when terminated via the multi-tasking panel. 2.2.2 09/30/2010 Fix bug in DATE function 2.2.1 07/13/2010 MathU RPN 2.2 adds the following features:
- Compatibility with iOS 4 and iPhone 4
- Add a preference to lock the orientation of the calculator (portrait or landscape)
- High resolution keypad for the retina display on iPhone 4
- Support for multitasking under iOS 4 2.2 07/01/2010 MathU RPN 2.1 adds support for copy and paste. Double tap the displayed number to copy or paste it.
The update also includes a bug fix for the AMORT function when computing amortization from the perspective of the bank.
MathU RPN 2.1 requires iPhone OS 3.0 or higher. 2.1 05/19/2010 MathU RPN 2.0 contains many major improvements to the calculator. Eighteen new functions have been added, some of the existing functions have been made more accessible and the display has been improved.
The update makes MathU RPN 2.0 a better programmer's calculator. The A-F keys are available right up front for easy entry in HEX mode and seven new functions for working with integers have been added.
MathU RPN 2.0 is also a better financial calculator. There are new functions for computing mortgage amortization and cash flow computations like IRR and NPV, as well as functions for working with dates. Many of the existing financial functions have been extended to handle odd periods (conforming to the same conventions as the HP-12C).
The scientific side of MathU RPN has also been improved by adding functions for linear regression as well as computing the percent of total.
In particular, improvements in this update include:
o A two line display option so you can see more of the stack.
o Date functions to compute the day of the week, days between dates, and a date in the future.
o Linear regression functions to compute an estimated y or x value along a fitted line.
o Bit manipulation functions to shift, mask and compute the number of bits in the integer representation of a number.
o Direct access to A-F in HEX mode for easy number entry. The A-F keys replace the financial functions on the keypad when a non-decimal number base is being used.
o Improved display of HEX, OCT, BIN numbers with bit position subscripts for easy interpretation. Very long binary numbers wrap over two lines when they get too big.
o Direct access to storage registers 10-19 via the STO .0 through STO .9.
o Extensions to the financial functions to handle odd period calculations. MathU RPN now conforms to the same conventions as those used on the HP-12C.
o An extension to the random number function RAND to compute random integers when the calculator is in HEX, OCT or BIN mode. In decimal DEC mode, RAND generates a random real value between 0.0 and 1.0.
o A new preference to choose between a single line display or the two line display (Show More Stack) and a preference to choose the date format (M.DY vs D.MY).
o [Bug fix] Word size setting in the preferences now supports the full 48 bits. 2.0 01/14/2010 Improvements in MathU RPN 1.2:
- Support storage register arithmetic with
financial functions (STO + PMT)
- Use anti-aliased fonts for button and
function labels
- Reposition shift buttons in landscape mode
to make them easier to use
- Seed RAND function with current time so that
the sequence of numbers is always different
- Extend factorial function (n!) to compute
the Gamma function for non-integer values
- Give user the choice between opening the
documentation or the preferences when the (i)
is tapped 1.2 02/20/2009 1.1.2 11/16/2008 1.1.1 11/01/2008 1.0.0 10/17/2008
MathU RPN Calc version 4.1.3
Updated At: 2026-02-23
Changes: We are excited to announce that MathU RPN now runs on macOS as well as iOS! Both Intel and Apple Silicon is supported for macOS. The 4.1.3 release fixes a few minor bugs I found after I released 4.1.0.
Keyboard support: An attached external keyboard can be used with the calculator to access the functions (type of name on the top if a button). Tap the Key Help button to see what strings will work to "press" a button on the keypad.
MathU RPN Calc version 4.0.2
Updated At: 2023-11-20
Changes: Nov 20, 2023
Version 4.0.2
MathU RPN 4.0.2 adds:
- support for bluetooth keyboard so you can "press" buttons by typing the name of the key on the calculator
- support for iOS 16.x and iOS 17.x
- bug fix for copy & paste feature that wasn't working with MathU RPN 4.0.0
- bug fix for random crashes
MathU RPN also runs on macOS with Silicon!
MathU RPN Calc version 4.0.1
Updated At: 2023-11-11
Changes: Nov 11, 2023
Version 4.0.1
MathU RPN 4.0.1 adds:
- support for bluetooth keyboard so you can "press" buttons by typing the name of the key on the calculator
- support for iOS 16.x and iOS 17.x
- bug fix for copy & paste feature that wasn't working with MathU RPN 4.0.0
MathU RPN also runs on macOS with Silicon!
MathU RPN Calc version 4.0.0
Updated At: 2023-10-24
Changes: Oct 24, 2023
Version 4.0.0
MathU 4.0.0 adds
- support for a bluetooth keyboard so you can "press" buttons by typing the name of the key on the calculator.
- support for iOS 16.x and iOS 17.x.
MathU 4.0.0 also runs on macOS with Apple Silicon!
MathU RPN Calc version 3.2.2
Updated At: 2020-09-25
Changes: Sep 25, 2020 Version 3.2.2
MathU RPN 3.2.2 adds support for iOS multitasking, iPad split screen and iOS 14 as well a supporting a 2X larger keypad on iPad. This update is recommended for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. New for the 3.2.2 update is improved built-in documentation, the ability to turn the stack labels (X: and Y:) on/off, improved support for Dark Mode, fixes for iOS 10.x through 13.x, and other bug fixes (including an issue when using the France region's number separators).
MathU RPN Calc version 3.2.1
Updated At: 2020-08-23
Changes: Aug 23, 2020 Version 3.2.1
MathU RPN 3.2.1 adds support for iOS multitasking, iPad split screen and iOS 13 as well a supporting a 2X larger keypad on iPad. This update is recommended for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. New for the 3.2.1 update is improved built-in documentation, the ability to turn the stack labels (X: and Y:) on/off, improved support for Dark Mode, bug fixes for iOS 10.x through 12.x, and other bug fixes.
MathU RPN Calc version 3.2
Updated At: 2020-08-20
Changes: Aug 20, 2020 Version 3.2
MathU RPN 3.2 adds support for iOS multitasking, iPad split screen and iOS 13 as well a supporting a 2X larger keypad on iPad. This update is recommended for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s. New for the 3.2 update is improved built-in documentation, the ability to turn the stack labels (X: and Y:) on/off, improved support for Dark Mode, and bug fixes.
MathU RPN Calc version 3.1
Updated At: 2020-07-01
Changes: Jul 1, 2020 Version 3.1
MathU RPN 3.1 adds support for iOS multitasking, split screen and iOS 13 as well a supporting a 2X larger keypad on iPad. This update is recommeneded for all users with iPhone or iPad running iOS 9.3 or higher except the iPhone 4s.
MathU RPN Calc version 3.0.4
Updated At: 2017-11-30
Changes: Nov 30, 2017 Version 3.0.4
Compatibility release for iOS 11.x. Fixes a few issues in the 3.0.3 release.
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