Change:
might propose to remove a member of a group has been inactive for a long time, or propose adding a newly-hired staff member to a group representing a real-world team.  Proposals originating outside the <del> group are identified by having a "sender" value in the range 0xFFFFFF00 - 0xFFFFFFFF. The specific value 0xFFFFFFFF is reserved for clients proposing that they themselves be added.  Proposals with types other than Add MUST NOT be sent with this sender index.  In such cases, the MLSPlaintext MUST be signed with the private key corresponding to the ClientInitKey in the Add message.  Recipients MUST verify that the MLSPlaintext carrying the Proposal message is validly signed with this key. The remaining values 0xFFFFFF00 - 0xFFFFFFFE are reserved for signer that are pre-provisioned to the clients within a group.  If proposals with these sender IDs are to be accepted within a group, the members of the group MUST be provisioned by the application with a mapping between sender indices in this range and authorized signing keys.  To ensure consistent handling of external proposals, the application MUST ensure that the members of a group have the same mapping and apply the same policies to external proposals. </del> <ins> group are identified by an "preconfigured" or "new_member" SenderType in MLSPlaintext. The "new_member" SenderType is used for clients proposing that they themselves be added.  For this ID type the sender value MUST be zero. Proposals with types other than Add MUST NOT be sent with this sender type.  In such cases, the MLSPlaintext MUST be signed with the private key corresponding to the ClientInitKey in the Add message. Recipients MUST verify that the MLSPlaintext carrying the Proposal message is validly signed with this key. The "preconfigured" SenderType is reserved for signers that are pre- provisioned to the clients within a group.  If proposals with these sender IDs are to be accepted within a group, the members of the group MUST be provisioned by the application with a mapping between these IDs and authorized signing keys.  To ensure consistent handling of external proposals, the application MUST ensure that the members of a group have the same mapping and apply the same policies to external proposals. </ins> An external proposal MUST be sent as an MLSPlaintext object, since the sender will not have the keys necessary to construct an

Discussion:
Action item from Singapore: it seems better to specify directly in the message if we have an external sender instead of using reserved ranges.
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