Validation specified in parameters -> schema do not show in mustache tags?

Description

It appears that validation parameters (min/max, length, items, etc) that are put into the parameters { schema { } } (such as for body parameters) do not show up in codegen mustache tags and cannot be used to validate input.

Is this intended or missing functionality?

Swagger-codegen version

HEAD

Swagger declaration file content or url

{  
                  "description":"A list of contacts to edit",
                  "in":"body",
                  "name":"contact_ids",
                  "required":true,
                  "schema":{  
                     "description":"contact_ids array",
                     "items":{  
                        "description":"ID of the contact to edit",
                        "format":"int32",
                        "title":"delete_characters_character_id_contacts_contact_id",
                        "type":"integer"
                     },
                     "maxItems":20,
                     "minItems":1,
                     "title":"delete_characters_character_id_contacts_contact_ids",
                     "type":"array"
                  }
               },

Mustache output:

{
        "isBodyParam" : true,
        "hasMore" : true,
        "isContainer" : true,
        "secondaryParam" : true,
        "isPrimitiveType" : true,
        "baseName" : "contact_ids",
        "paramName" : "contactIds",
        "dataType" : "[]int32",
        "description" : "A list of contacts to edit",
        "unescapedDescription" : "A list of contacts to edit",
        "jsonSchema" : "{\r\n  \"in\" : \"body\",\r\n  \"name\" : \"contact_ids\",\r\n  \"description\" : \"A list of contacts to edit\",\r\n  \"required\" : true,\r\n  \"schema\" : {\r\n    \"title\" : \"delete_characters_character_id_contacts_contact_ids\",\r\n    \"type\" : \"array\",\r\n    \"description\" : \"contact_ids array\",\r\n    \"items\" : {\r\n      \"type\" : \"integer\",\r\n      \"format\" : \"int32\",\r\n      \"description\" : \"ID of the contact to edit\",\r\n      \"title\" : \"delete_characters_character_id_contacts_contact_id\"\r\n    }\r\n  }\r\n}",
        "isBinary" : false,
        "isListContainer" : true,
        "isEnum" : false,
        "vendorExtensions" : {
          "x-exportParamName" : "ContactIds"
        },
        "required" : true
      }, 

Start by tracing how the parameters { schema { } } content is turned into codegen Mustache parameter tags, using the provided body-parameter example as the reproduction case. Determine whether schema validations such as minItems and maxItems are intentionally omitted or lost, and consider the issue complete when the intended behavior is established and covered by an appropriate regression check.