pgsql: Prevent infinity and NaN in jsonb/plperl transform

Prevent infinity and NaN in jsonb/plperl transform

jsonb uses numeric internally, and numeric can store NaN, but that is
not allowed by jsonb on input, so we shouldn't store it.  Also prevent
infinity to get a consistent error message.  (numeric input would reject
infinity anyway.)

Reported-by: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/e348e7ae5727a6da8678036d748e5c5af7deb6c9

Modified Files
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contrib/jsonb_plperl/expected/jsonb_plperl.out  | 24 ++++++++++++++++++++++--
contrib/jsonb_plperl/expected/jsonb_plperlu.out | 24 ++++++++++++++++++++++--
contrib/jsonb_plperl/jsonb_plperl.c             | 16 ++++++++++++++--
contrib/jsonb_plperl/sql/jsonb_plperl.sql       | 22 ++++++++++++++++++++++
contrib/jsonb_plperl/sql/jsonb_plperlu.sql      | 22 ++++++++++++++++++++++
5 files changed, 102 insertions(+), 6 deletions(-)