Further fix crash in smartmatch with Numeric
Further fix crash in smartmatch with Numeric

While the original fix[^1] for this issue solved the problem for
non-numeric strings, the problem still remained for other objects
that don't provide .Numeric method, like Pair:D ~~ Num:D

Fix by wrapping the numerification in a `try`. Not using `.?` here,
because it's broken and useless for its purpose, because it
would still fail here for objects that only provide .Numeric for :U

[1] https://github.com/rakudo/rakudo/commit/84b7ebdf425a25731425541f

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