Definition of whitespace in Json
Insignificant whitespace is defined in the RFC4627 for JSON:
Insignificant whitespace is allowed before or after any of the six
structural characters.
ws = *( %x20 / ; Space %x09 / ; Horizontal tab %x0A / ; Line feed or New line %x0D ; Carriage return )By the way, the default encoding is UTF-8:
JSON text SHALL be encoded in Unicode. The default encoding is UTF-8.
That being said, I don't think they intended to accept all forms of Unicode spaces in the original implementation.