DecodeTOML decodes toml from r in to v.

Flatten calls `Unwrap() []error` on each error and subsequent returned error that implement the method, returning a fully flattend sequence.

MultiErrorList returns an error which formats underlying errors as a list, or nil if err is nil.

NewErrDuplicate returns an ErrInvalid with a standard duplicate message.

Validate returns any errors from calling Validated.ValidateConfig on cfg and any nested types that implement Validated.

Duration is a non-negative time duration.

Validated configurations impose constraints that must be checked.

UniqueStrings is a helper for tracking unique values in string form.

URL extends url.URL to implement encoding.TextMarshaler.