Avoid Object.defineProperties in lib/leap.js.
Avoid Object.defineProperties in lib/leap.js.

These Entry types are all internal data structures, so there's really no
benefit to making their properties non-{writable,enumerable,configurable}.

RReverser/js-goto-transpiler,kittens/regenerator,kittens/regenerator,juliocanares/regenerator,rafaelstz/regenerator,liviuignat/regenerator,facebook/regenerator,facebook/regenerator,Jericho25/regenerator,liviuignat/regenerator,Jericho25/regenerator,RReverser/js-goto-transpiler,sebmck/regenerator,juliocanares/regenerator,sebmck/regenerator,rafaelstz/regenerator,facebook/regenerator