[BUG] Action.Http body with Input.Number trimmed

Action.Http cuts off the first and last digit of the value of a Input.Number substitution.

It does this because StringWithSubstitutions::substituteInputValues() calls JSON.stringify(), then removes the first and last character:

https://github.com/microsoft/AdaptiveCards/blob/23b09872ec0f987ae427a69525d8f0fca256ab3f/source/nodejs/adaptivecards/src/shared.ts#L117-L118

Presumably it was written assuming the .value will always be a string and therefore be wrapped in double quotes, but in this case, it's a number, and the JSON numbers are unquoted.

For example, entering the number 12.34 will result in a JSON payload of "2.3".

Action.Http Snippet

"body": "{\"numberProperty\":\"{{aNumberInput.value}}\"}",

HTTP POST Body

{"numberProperty":"2.3"}"

{
  "type": "AdaptiveCard",
  "body": [
    {
      "type": "Input.Number",
      "id": "aNumberInput"
    },
    {
      "type": "ActionSet",
      "actions": [
        {
          "type": "Action.Http",
          "title": "Submit",
          "method": "POST",
          "url": "https://example.com",
          "body": "{\"numberProperty\":\"{{aNumberInput.value}}\"}",
          "headers": [
            {
              "name": "Authorization",
              "value": ""
            },
            {
              "name": "Content-Type",
              "value": "application/json"
            }
          ]
        }
      ]
    }
  ],
  "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
  "version": "1.0"
}

previously reported https://github.com/microsoft/AdaptiveCards/issues/5218

Version Tested: adaptivecards@.0.6

Inspect source/nodejs/adaptivecards/src/shared.ts at the substituteInputValues() logic around lines 117-118, then reproduce the issue with the provided Action.Http card and Input.Number value. Done means numeric substitutions preserve the complete value and the resulting HTTP POST body is valid JSON rather than losing digits.