implement a compiler option for adding custom internal functions
implement gojq.Marshal function for jq-flavored encoding
fix slurp option with JSON file arguments
fix escaping characters in object keys
fix normalizing negative int64 to int on 32-bit architecture
fix crash on continuing iteration after emitting an error
iter.Next() does not normalize NaN and infinities anymore. Library users should take care of them. To handle them for encoding as JSON bytes, use gojq.Marshal. Also, iter.Next() does not clone values deeply anymore for performance reason. Users must not update the elements of the returned arrays and objects.
improve performance of outputting JSON values by about 3.5 times
