IDFromString attempts to create an ID from a base-16 string.

NewURLsMap returns a URLsMap instantiated from the given string, which consists of discovery-formatted names-to-URLs, like: mach0=http://1.1.1.1:2380,mach0=http://2.2.2.2::2380,mach1=http://3.3.3.3:2380,mach2=http://4.4.4.4:2380.

ID represents a generic identifier which is canonically stored as a uint64 but is typically represented as a base-16 string for input/output.

IDSlice implements the sort interface.

Uint64Slice implements sort interface.

URLsMap is a map from a name to its URLs.