Commits on Sep 12, 2024

1. Configurably allow duplicates in FileDataSourceImpl …

   This PR modifies the `FileDataSourceImpl` to accept an additional value in the
   options hash called `allow_duplicates`. `false` will be used if no value is
   provided which will cause this to operate exactly as it does prior to this
   change.
   
   Configuring `allow_duplicates` to be `true` will not raise an error when flag or
   segment values are loaded from multiple files and a subsequent file contains a
   key found in a previous file.
   
   The purpose of this is to allow a notion of a 'local' override during
   development. A project may have a `/config/feature_flags.yml` and a developer
   adds a flag to it for a feature they are developing. If they want to commit
   code with this feature, but don't want other developers encountering it yet,
   they will have to remember to turn the feature off prior to commiting their
   change.
   
   With this change, a project could have a `/config/feature_flags.yml` which
   contains the flag values other developers should see, and a
   `/config/feature_flags.local.yml` file, ignored by source control and not
   checked in. As a developer is working on the new feature, they can have it
   enabled in the `.local` file so they can see the feature and work with it, but
   disabled in the commited file so it does not impact other developers.

   

   djmorton42 committed Sep 12, 2024
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