Coerce retail_price to a Decimal with 2 decimal places and validate. This handles Decimal representations that may use scientific not

Check whether a field on an instance would change if updated with new_value. Uses the model field's to_python() to convert the new va

* Resolve a relative URL pathname against a base URL pathname. * * @param {String} relative Pathname of the relative URL. * @param {String} base Pa

Convert an arbitrary value (possibly '£12.30', '12,345.6', float, numpy number) into a Decimal quantized to 2 dp. Raises ValueError if it can