This coercion caused difficult-to-diagnose bugs sometimes. Because there
are some situations where converting a string to a name should be done
by parsing the string, and others where it should not, an explicit
choice seems better here.
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Co-authored-by: Mac Malone <tydeu@hatpress.net>
Added recursion cases to the diff algorithm for projections and mdata.
Previously, these would be rendered as the entire expression being different but we can do better
by checking if the recursion args are the same.
With mdata, these are entirely ignored by the diff algorithm.
