PHP Data Types

From manual page: https://php.net/language.types.intro

Hey there,
it seems to me that there is an issue with the list of expression data types in the documentation introduction on the topic.
The part I am talking about is:

_Every single expression in PHP has one of the following built-in types depending on its value:

• bool
• int
• float (floating-point number)
• string
• array
• object
• callable
• resource

To be more specific, there are two things that confused me:

1. Shouldn't enumeration be named here as well, as it is not the same as an object?
2. I am uncertain why callable is listed here, as callable is not a data type per se, more of a type declaration (or pseudo type) that different data types like string, array or object (Closure or invokable) can fullfill.

Start with the linked PHP manual page, language.types.intro, and review the quoted list of expression data types against the current PHP type documentation. Done means the introduction accurately explains whether enumerations belong in the list and how callable should be characterized.