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@@ -405,7 +405,7 @@ Returns an array an intersection of two. For example, `intersection(["a","b","c"
#### `is_a`
-Boolean check to determine whether a variable is of a given data type. This is equivalent to the `=~` type checks.
+Boolean check to determine whether a variable is of a given data type. This is equivalent to the `=~` type checks. This function is only available in Puppet 4, or when using the "future" parser.
~~~
foo = 3