],

// Each decoder is responsible for handling any indirections associated
// with the data structure. If any pointer so reached is nil, allocation must
// be done.

// decAlloc takes a value and returns a settable value that can
// be assigned to. If the value is a pointer, decAlloc guarantees it points to storage.
// The callers to the individual decoders are expected to have used decAlloc.
// The individual decoders don't need it.