Evaluate the resolved rules for one value, returning the first failure
message or null. Supports the rule shapes the registry and formConfig
produce: required, type: 'email' | 'url', pattern, len/min/max,
and custom async validators (which is how the json type validates).
Evaluate the resolved rules for one value, returning the first failure message or
null. Supports the rule shapes the registry andformConfigproduce:required,type: 'email' | 'url',pattern,len/min/max, and custom asyncvalidators (which is how thejsontype validates).