You are trying to write a unicode encoded character to a file but the file has not been opened with an encoding that can cope. You need something like this (untested):

 {open(my $F, ">:encoding(UTF-8)", $f) or die "Cannot open $f";
  say {$F} $s;
 }

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In reply to Re: JSON::XS and unicode by philiprbrenan
in thread JSON::XS and unicode by kimmel

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