title: How to reference enum value in API Blueprint(MSON)
body: <p>I'm using <a href="https://apiblueprint.org/" rel="noreferrer">API Blueprint</a> and <a href="https://github.com/danielgtaylor/aglio" rel="noreferrer">Agilo</a> to render my API documentation. When using enum type, I'm observing a weird behavior. The response is not shown with the defined enum value whereas the schema is showing all the enum values (which is expected) along with the declared value ('Monday'- Refer Actual) as well.</p>
  
  <p>Data Structure section</p>
  
  <pre><code># Data Structures
  
  ## Days (enum[string])
  + `Monday`
  + `Tuesday`
  + `Wednesday`
  + `Thursday`
  
  ## ListEntry
  - playOrder: 1 (number)
  - Id: 37a21975a499494f03367 (string)
  - programDay: `Tuesday` (Days)
  
  ## `sample-request-200`
  - id: 58828b2941cc351348 (string)
  - startDate: `2019-08-01T11:00:00.000Z` (string)
  - endDate: `2019-08-05T11:55:59.000Z` (string)
  - Language: `en-US` (string)
  - entries: ListEntry (array[object])
  </code></pre>
  
  <p>API Request Doc section</p>
  
  <pre><code>+ Request
  + Headers
  
          Content-Type: application/json
  
  + Attributes (sample-request-200)
  </code></pre>
  
  <p><strong>Actual</strong></p>
  
  <pre><code>---- JSON Body ----  
  
      {
        "playOrder": 1,
        "Id": "37a21975a499494f03367",
        "programDay": "Hello, world!" // Agilo shows "Hello,World" when some error occurred
      }
  
  -----Generated Schema-----  
  
  "programDay": {
                "type": "string",
                "enum": [
                  "Monday",
                  "Tuesday",
                  "Wednesday",
                  "Thursday",
                  "Monday"
                ]
              }
  </code></pre>
  
  <p><strong>Desired</strong></p>
  
  <pre><code> ---- JSON Body ----
      {
        "playOrder": 1,
        "Id": "37a21975a499494f03367",
        "programDay": "Monday"
      }
  
  
  -----Generated Schema-----  
  
  "programDay": {
                "type": "string",
                "enum": [
                  "Monday",
                  "Tuesday",
                  "Wednesday",
                  "Thursday"
                ]
              }
  </code></pre>
  
  <p>Any idea on how to use the defined enum data structure in API blueprint (MSON). Not sure how to reference an enum value in the Object.</p>
  
  <p>Is it right to use as below to reference an enum value?</p>
  
  <pre><code>- programDay: `Tuesday` (Days)
  </code></pre>