Inaccurate Float-to-Decimal Conversion in parse_value of Decimal Scalar

[mak626]

Current Behavior

The parse_value function currently converts the input using _Decimal(value). When a float is passed as input, this conversion may lead to precision loss due to the inherent imprecision of floating-point representations.

Steps to Reproduce

1. Call Decimal.parse_value(0.01).
2. Observe that the resulting Decimal does not accurately represent the value 0.01 instead gives0.01000000000000000020816681711721685132943093776702880859375 which is inaccurate.

Expected Behavior

The function should convert the input to a string before creating the Decimal object (i.e., using _Decimal(str(value))). This approach ensures that decimal values are accurately converted, even if not provided as string, preserving their intended precision.

see Strawberry implementation

Suggested Fix

Modify the parse_value function as follows:

@staticmethod
def parse_value(value):
    try:
        return _Decimal(str(value))
    except Exception:
        return Undefined