:decimal_transform — removes Decimal value-transforming calls.

The family replaces a value-transforming Decimal call with its input, testing whether removing the transformation causes a test failure:

Decimal.normalize(num)        # -> num
Decimal.apply_context(num)    # -> num
Decimal.abs(num)              # -> num
Decimal.negate(num)           # -> num
Decimal.sqrt(num)             # -> num
Decimal.round(num, places)    # -> num

A pipe stage collapses to what is piped into it: num |> Decimal.normalize() -> num.