Make r.default and non-existence errors not rely on exceptions #7144
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Other kinds of errors (rarer kinds) still use exceptions (as so many assertions and error-checking logic uses them).
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Other kinds of errors (rarer kinds) still use exceptions (as so many assertions and error-checking logic uses them).
May resolve #4271.
I need to re-review this, check test coverage, etc. This won't be instantly merged.