Optional__kindDiscriminator kind, written on serialization (SohlEntity.toJSON) and read back on revival. Optional as constructor input — it is derived from the concrete class, not supplied by callers.
The base value before deltas (null to leave unset).
Handler for a CUSTOM delta (null if unused).
The deltas applied on top of the base.
Reason the value is disabled; "" (or falsy) means enabled.
Construction data for a ValueModifier.