ReadonlycapabilityThe owning capability's key (file#exportName) -- a rename never crosses capabilities.
ReadonlycurrentThe field's name after the rename -- matches an added entry in the same diff.
ReadonlypreviousThe field's name before the rename -- matches a removed entry in that capability's own field diff.
One added-field/removed-field pair correlated into a single rename via the current declaration's
renamedFrom(EVD-05).