feat: explain coercion of falsy and truthy values

content/actions/learn-github-actions/expressions.md

@@ -53,6 +53,8 @@ As part of an expression, you can use `boolean`, `null`, `number`, or `string` d
 | `number`  | Any number format supported by JSON. |
 | `string`  | You don't need to enclose strings in `{% raw %}${{{% endraw %}` and `{% raw %}}}{% endraw %}`. However, if you do, you must use single quotes (`'`) around the string. To use a literal single quote, escape the literal single quote using an additional single quote (`''`). Wrapping with double quotes (`"`) will throw an error. |
 
+Note that in conditionals, falsy values (`false`, `0`, `-0`, `""`, `''`, `null`) are coerced to `false` and truthy (`true` and other non-falsy values) are coerced to `true`.
+
 ### Example of literals
 
 {% raw %}
@@ -126,7 +128,7 @@ env:
 {% endraw %}
 
 In this example, we're using a ternary operator to set the value of the `MY_ENV_VAR` environment variable based on whether the {% data variables.product.prodname_dotcom %} reference is set to `refs/heads/main` or not. If it is, the variable is set to `value_for_main_branch`. Otherwise, it is set to `value_for_other_branches`.
-It is important to note that the first value after the `&&` condition must be `truthy` otherwise the value after the `||` will always be returned.
+It is important to note that the first conditional after the `&&` must be `true`. Otherwise, the value after the `||` will always be returned.
 
 ## Functions