Introduce secret data type

CHANGELOG.yaml

@@ -1,3 +1,7 @@
+master:
+  new features:
+    - Added support for "password" data type in Variable
+
 4.1.0:
   date: 2021-08-16
   new features:

lib/collection/variable.js

@@ -257,6 +257,28 @@ _.assign(Variable, /** @lends Variable */ {
          */
         number: Number,
 
+        /**
+         * Free-form type of a value. This is the default for any variable, unless specified otherwise. It ensures that
+         * the variable can store data in any type and no conversion is done while using {@link Variable#get}.
+         */
+        any: {
+            /**
+             * @param {*} val -
+             * @returns {*}
+             */
+            in (val) {
+                return val; // pass through
+            },
+
+            /**
+             * @param {*} val -
+             * @returns {*}
+             */
+            out (val) {
+                return val; // pass through
+            }
+        },
+
         /**
          * A "array" type value stores Array data format
          */
@@ -342,26 +364,10 @@ _.assign(Variable, /** @lends Variable */ {
         },
 
         /**
-         * Free-form type of a value. This is the default for any variable, unless specified otherwise. It ensures that
-         * the variable can store data in any type and no conversion is done while using {@link Variable#get}.
+         * A "password" type is essentially a string. The conflation of data-type and input nature is a deliberate
+         * attempt to make dealing with sensitive data within environment templates.
          */
-        any: {
-            /**
-             * @param {*} val -
-             * @returns {*}
-             */
-            in (val) {
-                return val; // pass through
-            },
-
-            /**
-             * @param {*} val -
-             * @returns {*}
-             */
-            out (val) {
-                return val; // pass through
-            }
-        }
+        password: String
     },
 
     /**