Telegram's optional int/bool/float fields are pointers so callers can
explicitly send false or 0 to override a chat default — distinct from
'absent', which uses the chat default. The pointer construction has been
ergonomically painful:
photoLimit := int64(5)
Limit: &photoLimit
api.Ptr[T any](v T) *T collapses that to a single line:
Limit: api.Ptr[int64](5)
DisableNotification: api.Ptr(true)
Pointers stay because the explicit-zero distinction matters for fields
like DisableNotification, ProtectContent, and getUpdates.Offset where
sending 0 / false explicitly is semantically different from omitting
the field.
