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, power levels can optionally be represented in string format instead of integer format. A homeserver must be prepared to deal with this by parsing the power level from a string. In these cases, the following formatting of the power level string is allowed:

• a single base 10 integer, no float values or decimal points, optionally with any number of leading zeroes ("100", "000100");
• optionally with any number of leading or trailing whitespace characters (" 100 ", " 00100 ");
• optionally prefixed with a single - or + character before the integer but after leading whitespace padding (" +100 ", " -100 ", "+100", "-100").

{{% boxes/note %}} The integer represented by the string must still be within the [-(2**53)+1, (2**53)-1] range accepted by normal, non-string, power level values. {{% /boxes/note %}}