:decimal_zero_boundary — makes Decimal sign predicates inclusive of zero.

The family broadens strict sign classification around zero:

Decimal.positive?(num) # -> Decimal.gte?(num, 0)
Decimal.negative?(num) # -> Decimal.lte?(num, 0)

Piped calls keep the zero operand visible in the pipe stage:

num |> Decimal.positive?() # -> num |> Decimal.gte?(0)