A metamodel expression, that is, a typed reference to a type, class, function or value.

Examples:

`List<String>`
`sum<Float>`
`system.milliseconds`

Not to be confused with Dec, which represents a detyped reference. Simply speaking, if there’s a keyword (`class String`, `value system`), then it’s a Dec, otherwise it’s a Meta.

Initializer
Meta()
Inherited Attributes
Attributes inherited from: Expression
Attributes inherited from: ExpressionIsh
Attributes inherited from: Node
Attributes inherited from: Object
Inherited Methods
Methods inherited from: Node
Methods inherited from: Object