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matrix-spec/content/rooms/fragments/v1-stringy-power-levels.md

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##### `m.room.power_levels` events accept values as strings
In order to maintain backwards compatibility with early implementations,
each of the integer-valued properties within
[`m.room.power_levels`](/client-server-api#mroompower_levels) events can
be encoded as strings instead of integers. This includes the nested values
within the `events`, `notifications` and `users` properties.
For example, the following is a valid `m.room.power_levels` event in this room version:
```json
{
"content": {
"ban": "50",
"events": {
"m.room.power_levels": "100"
},
"events_default": "0",
"state_default": "50",
"users": {
"@example:localhost": "100"
},
"users_default": "0"
},
"origin_server_ts": 1432735824653,
"room_id": "!jEsUZKDJdhlrceRyVU:example.org",
"sender": "@example:example.org",
"state_key": "",
"type": "m.room.power_levels"
}
```
When the value is representative of an integer, they must be the following format:
* a single base 10 integer, no float values or decimal points, optionally with
any number of leading zeroes (`"100"`, `"000100"`);
* optionally prefixed with a single `-` or `+` character before the integer (`"+100"`,
`"-100"`).
* optionally with any number of leading or trailing whitespace characters (`" 100 "`,
`" 00100 "`, `" +100 "`, `" -100 "`);