Document why we add '$' prefix to result local in constructors #870
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We used to add a prefix before, but when I brought back the constructor
arguments I didn't include it because (1) the previous prefix was
_whichcaused lint errors (2) there were no tests or documentation on why the prefix
was needed.
Document it now so that it won't be removed again.
(I couldn't add this in #869 as I didn't have push access to the PR's repo)