Commits on May 13, 2019

1. Change multi-threading behavior of caches (AbstractTypeDicts). …

   Fix #548.
   
   This is a breaking change, although I doubt that a lot of people have
   been relying on this behavior up to this point.
   
   Previously, `AbstractTypeDict` subtypes such as `StateCache`,
   `DynamicsResultCache`, and `SegmentedVectorCache` would use the thread
   ID for the thread in which the value (e.g. `MechanismState`) was created as part
   of the key. This was not needed for thread-safety (a misunderstanding on
   my part), and led to some unexpected behavior (#548) as it wasn't
   documented properly. I also now consider it to be a poor separation of
   concerns: `AbstractTypeDict` should just be `Dict`-like, and `Dict`
   doesn't do anything special in the presence of multiple threads.
   
   See the following comments for more info on the past behavior and the
   change:
   
   * #548 (comment)
   * #548 (comment)

   

   tkoolen committed May 13, 2019
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