Keeping data between rounds

[t.tutiya]

For more infomation.

MAJOR weak_map GetSession() broken in 26.10

This is unfortunately intended. Use of session as a key in a module-scoped var weak_map may eventually gain back support for cross-round state (hence the scary “Note: …” part of the doc), but it was removed in 26.10. To protect against a behavior change (when cross-round state is added back), make sure to initialize your state at the beginning of OnBegin in a creative_device, e.g. if: set GlobalInt[GetSession()] = 0