There is no convenient way to define a numeric value in the Tuple function

Background

An easy way to experiment with Streaming Expressions is to define a tuple or list of tuples as a stream source and apply decorators\evaluators to this source. However, at the moment there is no easy way to define numeric values in a tuple because everything is being treated as a string.

Steps to Reproduce

Evaluate the following streaming expression:

tuple(int=13, float=42.42, string=foo, quoted_string="bar")

Actual Result:

"docs": [
  {
    "int": "13",
    "float": "42.42",
    "string": "foo",
    "quoted_string": "bar"
  },
  ...
]

Expected Result:

"docs": [
  {
    "int": 13,
    "float": 42.42,
    "string": "foo",
    "quoted_string": "bar"
  },
  ...
]

Possible Workarounds

It's possible to get the desired result by applying val() function to each numeric value, but it's not convenient:

tuple(int=val(13), float=val(42.42))