AssignRacks assigns racks to the players.

Return a user-friendly event description.

Leave returns the leave after playing or using `tiles` in `rack`.

NewGame creates a new GameDocument.

ProcessGameplayEvent processes a ClientGameplayEvent submitted by userID.

ReconcileAllTiles returns an error if the tiles on the board and on player racks do not match the letter distribution.

ReplayEvents plays the events on the game document.

ToCGP converts the game to a CGP string.

AlwaysAssignEmpty always assigns empty racks.

AssignEmptyIfUnambiguous assigns empty racks if they're the only thing they can be.

NeverAssignEmpty does not assign empty racks.

Redundant information, but we are deciding to treat different board layouts as different variants.

FakeNower uses a fake timer.

GameTimer uses the standard library's `time` package to determine how much time has elapsed in a game.

Nower is an interface for determining the current time.