If Perl, itself, does not internally know a value is a number, how can it convert a number to a string?
Looking at Mojo::JSON and JSON::Tiny, they both seem to be "pure Perl" implementations, so they would have to use heuristics.
Looking at perlapi:
SvNIOK "Returns a U32 value indicating whether the SV contains a number, integer or double."
So, it seems that, internally, Perl knows if a scalar is a number.
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