12.31

Any nonjson loop limit given as a positive number will locally override whatever limits normally would
exist for a std non-json loop. eg Loop (20000) will make the limit be 20000 whereas Loop(^length(...))
would limit to whatever the current limit it even if ^length returned a greater value.
^jsonopen optionally takes 2 additional arguments. First is the name of a concept whose
members are names of fields which if seen should be discarded. Second is the name of a
concept whose members are names of fields which are presumed to be string values, and
all blanks in the string should be converted to underscores.
^jsonparse optionally takes 2 additional arguments. (see #2)
%httpresponse has been extended with additional negative code values specific to curl failing to connect.
New void rule kind v: LABEL () which is faster and clearer than writing s: LABEL (?).
It is used as the target of ^reuse or ^refine.

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