Changed

• Breaking: Refactor the libraries into free functions and user defined value types (a69b4b) (@PaulRBerg)
• Breaking: Set minimum compiler pragma to >=0.8.13 (a69b4b) (@PaulRBerg)
• Breaking: Rename SCALE to UNIT (4d3658) (@PaulRBerg)
• Always truncate instead of rounding up in multiplication functions (21fb32) (@PaulRBerg)
• Change license to MIT (@PaulRBerg)
• Check if y is zero in gm (5b585c) (@PaulRBerg)
• Optimize avg by using the SWAR technique (#89) (@PaulRBerg)
• Optimize div and mulDivSigned by wrapping unary operations in unchecked blocks (a69b4b) (@PaulRBerg)
• Optimize exp2 by batching bit checks (#77) (@k06a)
• Optimize msb by using assembly (#135) (@t4sk, @PaulRBerg)
• Optimize result assignment in powu (673802) (@PaulRBerg)
• Rename fromInt to toSD59x18 and toInt to fromSD59x18 (a69b4b) (@PaulRBerg)
• Rename fromUint to toUD60x18 and toUint to fromUD60x18 (a69b4b) (@PaulRBerg)
• Rename mostSignificantBit to msb (a69b4b) (@PaulRBerg)
• Rename mulDivFixedPoint to mulDiv18 (4c5430) (@PaulRBerg)
• Rename PRBMath.sol to Core.sol (1b82ea) (@PaulRBerg)
• Rename shared sqrt in prbSqrt (1b82ea) (@PaulRBerg)
• Rename shared exp2 in prbExp2 (1b82ea) (@PaulRBerg)
• Revert with inputs instead of computed value custom errors (@PaulRBerg)
• Return base if exponent is one in pow (977d43) (@PaulRBerg)
• Format mathematical expressions using LaTeX (@PaulRBerg)
• Improve wording and formatting in comments, NatSpec documentation, and README (@PaulRBerg)

Added

• Add constants for E and PI (422d87) (@PaulRBerg)
• Add simple PRBTest-based typed assertions for testing in Foundry (ddb084) (@PaulRBerg)
• Add user defined value types SD59x18 and UD60x18 (@PaulRBerg)
• Implement conversion and helper functions for the user defined value types (@PaulRBerg)

Removed

• Breaking: Delete the e and pi functions (422d87) (@PaulRBerg)
• Breaking: Remove JavaScript SDK and all paraphernalia (1b82ea) (@PaulRBerg)

Fixed

• Fix incorrect hard-coded value in sqrt (#91) (@Amxx, @nonergodic)
• Fix upper boundary specified in exp NatSpec comments (#119) (@PaulRBerg)