.json() does not recognize null

[kseistrup]

When converting a string to JSON, null is not recognized:

⧐  "{\"x\": null}".json()
ERROR: identifier not found: null

However:

⧐  {"x": true}.x
true
⧐  {"x": true}.y
null

[odino]

The issue is that null is not a valid identifier, and you can't assign null to a value (though the interpreter assigns null at will, for example when destructuring):

⧐  x = null
ERROR: identifier not found: null
⧐  [a, b] = [1]
⧐  b
null

This shouldn't be crazy, let's see if I can have a look at it over the next couple of days.