Commits on Sep 18, 2020

1. Avoid repeatedly appending to yaml_implicit_resolvers …

   Repeated calls to `resolve` can experience performance degredation, if
   `add_implicit_resolver` has been called with `first=None` (to add an
   implicit resolver with an unspecified first character).
   
   For example, every time `foo` is encountered, the "wildcard implicit
   resolvers" (with `first=None`) will be appended to the list of implicit
   resolvers for strings starting with `f`, which will normally be the
   resolver for booleans. The list `yaml_implicit_resolvers['f']` will keep
   getting longer. The same behavior applies for any first-letter matches
   with existing implicit resolvers.
   
   This change avoids unintentionally mutating the lists in the class-level
   dict `yaml_implicit_resolvers` by looping through a temporary copy.
   
   Fixes: yaml#439

   

   psphicas committed Sep 18, 2020
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