Represents the name of an upgrade (Sum) that is cached (for map keys fast lookup instead of looping through all upgrades). In the form of: "sum/${start: DecimalJSONString}/${end: DecimalJSONString}"
Use an object index instead.
Represents the name of an upgrade (Sum) that is cached (for map keys fast lookup instead of looping through all upgrades). In the form of: "sum/${start: DecimalJSONString}/${end: DecimalJSONString}"