Module migrations 

Schema migration system for save data.

MigrationRegistry holds an ordered chain of MigrationFn values keyed by source version. migrate(data, from, to) runs the chain to bring save data from any older version up to the current version without data loss.

Structs

MigrationRegistry

Holds an ordered chain of migrations keyed by source version.

SaveData

Flexible key→value store that migrations read and modify.

SchemaVersion

A monotonically increasing version number for the save schema.

Enums

SaveValue

A flexible value type for use inside SaveData.

Type Aliases

MigrationFn

A function that transforms SaveData from version N to N+1.