DefaultValidator checks if the type implements the validator interface and calls the validate function if it does, returning the report.

GetFields takes a value of a struct and flattens all embedded structs in it.

Validate walks the structs, slices, and pointers in thing and calls any Validate(path.ContextPath) report.Report functions defined on the types, aggregating the results.

ValidateCustom validates thing using the custom validation function supplied.

StructField is an extension of go's reflect.StructField that also includes the value.