Enhancements:
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* Optimizations to rendering to speed up dealing with lots of recipes  #2838 #2848

Bug fixes:
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* include ``folder`` as a field in ``source`` for linting purposes  #2837
* remove merging of constraints.  Keep only the clobbering of groups of constraints by exact constraints (of which you can have only one)  #2839
* ensure u+w permissions before calling install_name_tool  #2840
* remove conversion of dash to underscore in pin_run_as_build  #2842

Contributors:
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* @jakirkham
* @mingwandroid
* @msarahan