Commits on Dec 29, 2018

1. Optimize the Ref class in src/core/primitives.js …

   The `toString` method always creates two string objects (for the 'R'
   character and for the `num` concatenation) and in the worst case
   creates three string objects (one more for the `gen` concatenation).
   For the Tracemonkey paper alone, this resulted in 12000 string
   objects when scrolling from the top to the bottom of the document.
   Since this is a hot function, it's worth minimizing the number of string
   objects, especially for large documents, to reduce peak memory usage.
   
   This commit refactors the `toString` method to always create only one
   string object.

   

   timvandermeij committed Dec 29, 2018
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