Sigv4.hex.digit: def of bend-kit-sigv4@0.11.0.1
Import: import bend-kit-sigv4@0.11.0.1/sigv4.bend as Sigv4
Lines 603-606 of bend-kit-sigv4@0.11.0.1/sigv4.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-sigv4@0.11.0.1/sigv4.bend&start_line=603&end_line=606

import Base

def hex.digit(+c: U32) -> Maybe<&2, U32>:
  Bool.pick(Maybe<&2, U32>, Bool.and(U32.is_le(48, c), U32.is_le(c, 57)), Some{(c - 48 : U32)},
    Bool.pick(Maybe<&2, U32>, Bool.and(U32.is_le(97, c), U32.is_le(c, 102)), Some{(c - 87 : U32)},
      Bool.pick(Maybe<&2, U32>, Bool.and(U32.is_le(65, c), U32.is_le(c, 70)), Some{(c - 55 : U32)}, None{})))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.pick
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_le
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub