reflect.Float64:    encFloat,
	reflect.Complex64:  encComplex,
	reflect.Complex128: encComplex,
	reflect.String:     encString,
}

// encOpFor returns (a pointer to) the encoding op for the base type under rt and
// the indirection count to reach it.
func encOpFor(rt reflect.Type, inProgress map[reflect.Type]*encOp, building map[*typeInfo]bool) (*encOp, int) {
	ut := userType(rt)