Type for money

[worldmind]

For money params we need special type, in Python, for example, it named decimal, PostgreSQL has numeric type.

[darrelmiller]

The semantics of decimal can be added using the format property. It will be included in the format registry that we will be creating #845

[spacether]

For context here openapi-generator does this for python decimal.Decimal amounts with:

type: string
format: number

[karenetheridge]

I could almost see a "number" format being useful, to specify strings that contain numeric data, but there's so many ways of representing a number, and some of them might not be suitable for a particular application. Also some numeric representations aren't practical in some languages.

For example, one could start out defining a number format as "any string that can be converted to a number in my language" -- so for perl, the easy way of implementing that is with looks_like_number, which handles values like "2.0", "2.5", "2e-3", "Inf" and "NaN" - but doesn't handle "0xDEADBEEF" or "0x1.23p-4" or "0 but true" (which are all treated internally as numbers without warning). Or in C, one could use atoi() but that doesn't match many numeric forms cleanly either.

tldr: formats like this are best defined locally to an application using a definition, so it can be tailored to the exact needs of that application, framework and language.