Revert private properties on $options in comapt mode

Editor assessment

fix(compat) says private properties on the options object are reverted in compat mode, but the misspelling in the subject and the terse wording make the intent less crisp. The body closes issue #3883 in valid footer syntax and the type and scope fit, while the header is imperative and unterminated. No explanation is given for why the revert was needed, so the why is absent. Understandable but marred by the typo and thin context, it lands as acceptable.