presence: Removal of `number` key support in `LatestMap` in v2.80

[jason-ha]

Broken API or pattern

Presence LatestMap key type inaccurately allows number type for keys and will be removed.

Preparation References

number keys have always been converted to strings at runtime and could never be enumerated. Any explicit specifications of number or literal number for Keys generic should be removed.

String pattern type ${number} can be used as alternative where number may previously have been used.

Packages

@fluidframework/presence

Expected Timeline

2.80