fieldKey property
The extension field's storage key in the extendee's backing map: the
bracketed fully-qualified extension name, e.g. [acme.user_email]. This
is the exact key the descriptor bridge writes.
Implementation
final String fieldKey;
The extension field's storage key in the extendee's backing map: the
bracketed fully-qualified extension name, e.g. [acme.user_email]. This
is the exact key the descriptor bridge writes.
final String fieldKey;