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Allow + in Matrix IDs. (#1583)

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Patrick Cloke 2023-07-04 09:40:43 -04:00 • committed by GitHub
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changelogs/appendices/newsfragments/1583.feature Normal file
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@ -0,0 +1 @@
Allow `+` in Matrix IDs, per [MSC4009](https://github.com/matrix-org/matrix-spec-proposals/pull/4009).

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content/appendices.md
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@ -540,6 +540,8 @@ be represented with a `domain` component under some conditions - see the
#### User Identifiers
{{% changed-in v="1.8" %}}
Users within Matrix are uniquely identified by their Matrix user ID. The
user ID is namespaced to the homeserver which allocated the account and
has the form:
@ -548,7 +550,7 @@ has the form:
The `localpart` of a user ID is an opaque identifier for that user. It
MUST NOT be empty, and MUST contain only the characters `a-z`, `0-9`,
`.`, `_`, `=`, `-`, and `/`.
`.`, `_`, `=`, `-`, `/`, and `+`.
The `domain` of a user ID is the [server name](#server-name) of the
homeserver which allocated the account.
@ -562,7 +564,7 @@ The complete grammar for a legal user ID is:
user_id_localpart = 1*user_id_char
user_id_char = DIGIT
/ %x61-7A ; a-z
/ "-" / "." / "=" / "_" / "/"
/ "-" / "." / "=" / "_" / "/" / "+"
{{% boxes/rationale %}}
A number of factors were considered when defining the allowable