followup #17852, disallow all:on for now for hint + friends #18311
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followup #17852
rationale: hints, warnings are a moving target
future work
--warningAsError:on
and enforce it for compiler sources; fix some bugs withwarningAsError:foo:on|off
#14068 accordingly--warningAsError:v1.4:on
,--warning:performance:on
--warning:deprecated:errorDefect:on