This would enable TagHelper users to write things like <input type=checkbox /> and have it output the identical code; whereas today we output <input type="checkbox" />.

This change would actually have a significant perf impact as well. Today in TagHelperOutput we have to write an attribute to an intermediate writer to potentially escape any double quotes in the case that a user wrote <input type=' """" ' /> since we always output with double quotes.

This intermediate writing step in my tests have represented over 5% of allocations.