[dependabot]

Bumps decimal from 3.1.1 to 3.2.0.

Release notes

Sourced from decimal's releases.

v3.2.0

Enhancements

• Make most operations faster. Compared with v3.1.2 on OTP 29, on decimals with up to 20 digits and exponents from -20 to 20, div/2 is about 8x faster, mult/2 6x, add/2 5x, round/3 4x, compare/2 2.7x and normalize/1 2x. On money amounts with two decimals, to_float/1 is about 23x faster, compare/3 18x, div/2 15x, rem/2 and sqrt/1 4x, round/3 2-3x, add/2, sub/2, mult/2, div_int/2 and compare/2 2-2.7x, and parsing 1.4x. from_float/1 and cast/1 of a float are about 3.4x faster and cast/1 of an integer 3x. to_string/1 is unchanged.

• Add the :subnormal and :clamped signals from the General Decimal Arithmetic spec. :subnormal is signalled for every result whose adjusted exponent is below emin, even an exact one, and :underflow only when such a result is also inexact. A zero result's exponent is kept between emin - precision + 1 and emax, the range of nonzero results, and :clamped is signalled when it has to move: Decimal.mult("0e-3500", "0e-3500") returns 0E-6176 instead of 0E-7000. This also applies to the zero results of division by infinity, of div_int/2 and div_rem/2 with a smaller dividend, and of sqrt/1. A subnormal result that rounds to zero signals :clamped too.

Bug fixes

• Fix Decimal.div/2 rounding some inexact results the wrong way. Under :half_even and :half_down, a result just above a tie was rounded as a tie, and under :ceiling, :floor and :up, a result whose first discarded digit was 0 was treated as exact even when later digits weren't, so :ceiling and :floor could return a value on the wrong side of the true quotient. About 5% of random divisions at the default precision were affected. :inexact was also missing when the remainder was a power of ten.

• Fix :up rounding changing exact values. A result whose discarded digits were all zero was still rounded away from zero: with precision: 1 and rounding: :up, Decimal.add(0, Decimal.new("9.0")) returned 10 instead of 9, and Decimal.round(Decimal.new(0), -1, :up) returned 1E+1 instead of 0E+1.

• Fix rounding carries leaving one digit more than the precision. Rounding 9.99 to precision 2 returned 10.0 instead of 10, and Decimal.div(95, 10) at precision 1 returned 10 instead of 1E+1. This affected every operation that rounds to the context precision, and the results now match the General Decimal Arithmetic spec and Python's decimal.

• Fix Decimal.sqrt/1 rounding inexact roots as if the first discarded digit were the whole remainder. At precision 9 under :ceiling, Decimal.sqrt(10) returned 3.16227766 instead of 3.16227767, and at

... (truncated)

Changelog

Sourced from decimal's changelog.

v3.2.0 (2026-10-10)

Enhancements

• Make most operations faster. Compared with v3.1.2 on OTP 29, on decimals with up to 20 digits and exponents from -20 to 20, div/2 is about 8x faster, mult/2 6x, add/2 5x, round/3 4x, compare/2 2.7x and normalize/1 2x. On money amounts with two decimals, to_float/1 is about 23x faster, compare/3 18x, div/2 15x, rem/2 and sqrt/1 4x, round/3 2-3x, add/2, sub/2, mult/2, div_int/2 and compare/2 2-2.7x, and parsing 1.4x. from_float/1 and cast/1 of a float are about 3.4x faster and cast/1 of an integer 3x. to_string/1 is unchanged.

• Add the :subnormal and :clamped signals from the General Decimal Arithmetic spec. :subnormal is signalled for every result whose adjusted exponent is below emin, even an exact one, and :underflow only when such a result is also inexact. A zero result's exponent is kept between emin - precision + 1 and emax, the range of nonzero results, and :clamped is signalled when it has to move: Decimal.mult("0e-3500", "0e-3500") returns 0E-6176 instead of 0E-7000. This also applies to the zero results of division by infinity, of div_int/2 and div_rem/2 with a smaller dividend, and of sqrt/1. A subnormal result that rounds to zero signals :clamped too.

Bug fixes

• Fix Decimal.div/2 rounding some inexact results the wrong way. Under :half_even and :half_down, a result just above a tie was rounded as a tie, and under :ceiling, :floor and :up, a result whose first discarded digit was 0 was treated as exact even when later digits weren't, so :ceiling and :floor could return a value on the wrong side of the true quotient. About 5% of random divisions at the default precision were affected. :inexact was also missing when the remainder was a power of ten.

• Fix :up rounding changing exact values. A result whose discarded digits were all zero was still rounded away from zero: with precision: 1 and rounding: :up, Decimal.add(0, Decimal.new("9.0")) returned 10 instead of 9, and Decimal.round(Decimal.new(0), -1, :up) returned 1E+1 instead of 0E+1.

• Fix rounding carries leaving one digit more than the precision. Rounding 9.99 to precision 2 returned 10.0 instead of 10, and Decimal.div(95, 10) at precision 1 returned 10 instead of 1E+1. This affected every operation that rounds to the context precision, and the results now match the General Decimal Arithmetic spec and Python's decimal.

• Fix Decimal.sqrt/1 rounding inexact roots as if the first discarded digit were the whole remainder. At precision 9 under :ceiling,

... (truncated)

Commits

• 401f262 Release v3.2.0
• 551f620 Describe the unreleased changes from the user's side in the changelog
• d76ab46 Make round/3 invalid where quantize is
• 3c90af4 Merge commit from fork
• 786e573 Performance: recover the correctness-fix regressions, skip rounding results t...
• 90317c0 Document that integer new/1 and new/3 skip the parse limits (#253)
• b279a2c Keep subnormal results and signal subnormal and clamped (#252)
• b96e60d Make compare/3 exact and compare/2 raise for NaN (#251)
• dc8cf66 Raise ArgumentError from to_integer/1 for NaN and Infinity (#250)
• b47ae81 Validate the context in Context.set/1 and with/2 (#249)
• Additional commits viewable in compare view

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