Commits on Nov 16, 2022

1. Eagerly initialize an mutable object for instance.refs …

   This micro-optimization never made sense and less so now that they're rare.
   
   This still initializes the class with a shared immutable object in the
   constructor - which is also what createClass() does.
   
   Then we override it during mount. This is done in case someone messes up
   the initialization of the super() constructor for example, which was
   more common in polyfills.
   
   This change means that if a ref is initialized during the constructor
   itself it wouldn't be lazily initialized but that's not user code that
   does it, it's React so that shouldn't happen.

   

   sebmarkbage committed Nov 16, 2022
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