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content/rooms/fragments/v1-floaty-power-levels.md
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##### `m.room.power_levels` events accept values as floats ##### `m.room.power_levels` events accept values as floats
When the value is a float, anything after the decimal point is removed, When the value is a float
making e.g. `5.17`, `5.42`, and `5` functionally identical. * First, exponential notation is applied: `5.114698E4` becomes `51146.98`
* Second, the value is truncated at the decimal point: `51146.98` becomes `51146`.
Any float greater than or equal to `1e309` must result in the powerlevel event
being rejected.
For example, this is a valid `m.room.power_levels` event in this room version: For example, this is a valid `m.room.power_levels` event in this room version:
@ -33,8 +37,5 @@ For example, this is a valid `m.room.power_levels` event in this room version:
In this example, both `@bob:localhost` and `@alice:localhost` have the same effective In this example, both `@bob:localhost` and `@alice:localhost` have the same effective
power level of `50`, even though the values are technically different. power level of `50`, even though the values are technically different.
When a float written in exponential notation is unpacked, the decimal portion is removed
afterward; for example, `5.114698E4` becomes `51146.98`, which is then truncated to `51146`.
Note that, since this room version does not enforce that events comply with the requirements Note that, since this room version does not enforce that events comply with the requirements
of [Canonical JSON](/appendices#canonical-json), power levels can be formatted as floats. of [Canonical JSON](/appendices#canonical-json), power levels can be formatted as floats.