tree d83a9e32e6dae2bac4bf1af860457ccb34cb8337
parent 394927195517255a9dd24c6d331ee177073df6f4
author Nate Bosch <nbosch1@gmail.com> 1602546233 -0700
committer GitHub <noreply@github.com> 1602546233 -0700
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Remove Marker as a name for null (#136)

The checks against `== Marker` won't upgrade a nullable variable to
non-nullable like `== null` would.

- Replace `Marker` with `null`. Remove the field.
- Add a doc comment on the class to link to the parsing spec and
  describe the usage of `null`.
- Add a doc comment on `add` to describe it's difference from the normal
  `List.add`.
- Add some comments and a link to an issue filed about a likely bug in
  this method.