kubernetes/staging/src/k8s.io/apiextensions-apiserver/pkg/apiserver/schema/defaulting/prune.go

// PruneDefaults prunes default values according to the schema and according to
// the ObjectMeta definition of the running server. It mutates the passed schema.
func PruneDefaults(s *structuralschema.Structural) error { … }

type pruner …

func (p *pruner) pruneDefaults(s *structuralschema.Structural, f SurroundingObjectFunc) (changed bool, err error) { … }