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instance method
JSON::Ext::Generator::State#allow_nan=
allow_nan=(enable)
ext/json/generator/generator.c
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static VALUE cState_allow_nan_set(VALUE self, VALUE enable)
{
rb_check_frozen(self);
GET_STATE(self);
state->allow_nan = RTEST(enable);
return Qnil;
}
This sets whether or not to serialize NaN, Infinity, and -Infinity