v0.2.0

Validate exact decimal amounts and choose accepted currencies with readable fluent chains. v0.2.0 adds decimal validation, package-defined currency identifiers, and clearer examples throughout the README.

What's new

• Exact decimal bounds and equality, including values beyond floating-point precision. Accepts json.Number and defined string types without rounding or rewriting the submitted value.
• MaxScale limits written fractional digits, including trailing zeros.
• Fluent currency allowlists such as .USD().EUR().GBP(), backed by 178 package-defined ISO identifiers. Selectors form one allowlist with OR semantics.
• Focused, spaced examples and a complete currency selector list in the README.

Try it

go get github.com/goforj/validation@v0.2.0

For an already decoded request:

err := validation.Validate(
    validation.Decimal("amount", request.Amount).
        Required().
        Min("0.01").
        MaxScale(2),

    validation.Currency("currency", request.Currency).
        Required().
        USD().
        EUR(),
)

See the examples, complete selector list, and contracts.

Upgrading

Existing APIs and the Go 1.24 minimum are unchanged. The runtime still has no external dependencies. Currency selectors define accepted identifiers; precision policy, conversion, arithmetic, and rounding remain application-owned.

Only the root module is published. The release review records exact coverage, fuzzing, resource checks, and public-consumer verification.