Decode a cursor token to its CursorPayload, or null when the
token is malformed.
A malformed token decodes to null and never throws — the caller branches on
null and refuses by name, which keeps a corrupt cursor a refused request
rather than an uncaught rejection off the public surface.
Decode a cursor token to its
CursorPayload, ornullwhen the token is malformed.A malformed token decodes to
nulland never throws — the caller branches onnulland refuses by name, which keeps a corrupt cursor a refused request rather than an uncaught rejection off the public surface.