Commits on Jan 21, 2021

1. Export oft-used types w/o exposing implementation …

   Export more types that meet these criteria:
   
   - Documented
   - Convenient for client code. They are already
   used in specs of public functions of their respective
   modules.
   - These types do not expose implementation details.
   
   The types are:
   
   ets.erl:
   - type() :: set | ordered_set | bag | duplicate_bag.
   
   supervisor.erl:
   - `restart() :: 'permanent' | 'transient' | 'temporary'
   - `mfargs() :: {M :: module(), F :: atom(), A :: [term()]
      | undefined}.`
   - `shutdown() :: 'brutal_kill' | timeout().`
   
   The reason for this change is to fix the status quo, which is
   that teams either must:
   - copy/pasta the types into client code, leading to code bloat and having
   to manually keep the types in sync.
   - OR refer to non-exported types, which will mean either more noise
   or less accuracy from code analysis tools. For example,
   Dialyzer will either warn or treat the types as `term()`.

   

   mheiber committed Jan 21, 2021
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