Remove unnecessary immutable stuff#738

Merged

samtstern merged 3 commits intofirebase:version-2.0.0-devfrom

SUPERCILEX:abstract-list

Jun 5, 2017

Commits on Jun 5, 2017

Restrict unnecessary immutable stuff to library so we can change it later
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Remove unnecessary immutable stuff
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Merge remote-tracking branch 'upstream/version-2.0.0-dev' into version-2.0.0-dev
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