With the -DSQLITE_ENABLE_JSON_NAN_INF compile-time option, non-standard

With the -DSQLITE_ENABLE_JSON_NAN_INF compile-time option, non-standard
JSON numeric values "Inf", "Infinity", "-Inf", "-Infinity", "NaN", "QNaN",
and "SNaN" are all accepted.  SQLite should never generate these values,
but it will accept that with the appropriate compile-time option.

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