pub const BUILTIN_FUNCTION_NAMES: &[&str];Expand description
Every function name that FunctionConfig’s deserializer resolves to a
typed built-in variant instead of FunctionConfig::Custom.
Used in error messages and as the discriminator for FunctionConfig
deserialization. Kept in one place so adding a new built-in updates the
dispatch, the error suggestion list, and the docs in lockstep.
Public so a service layer that gates workflow authoring on a closed
function set can derive that set rather than copy it. Membership here is
not the same fact as “this engine can run it” — see
builtin_function_kind, and prefer it for that question.
§Stability
Names are only added in a minor release and only removed in a major one, so
a caller may treat a name that appears here as durable. Ordering is not
meaningful and may change without notice; treat this as a set. Note that
validation and validate are both present and both resolve to
FunctionConfig::Validation.