js: Rename RawString to ImmutableString #1031
Merged
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Problem: RawString is an unhelpful name. A RawString is a string which is not collaborative, we don't create an op for each character in it but instead have a single op which sets the value of the whole string. It's useful when you expect to have a large string which will never be edited by a user (such as the output of a compilation step).
Solution: Rename RawString to ImmutableString, which better reflects why you might use it.