Is any part of the data type declaration case-sensitive?

I'm having problems on one of my wikis, where using

[[has Type::Number]]

or variations still causes numbers to show links to internal pages (which don't exist). Is "has", "type", or "number" case-sensitive?

Feuertier (talk)

"has Type" is not a valid declaration but "Has type" is, see also Special property "Has type" and Help:Property declaration.

James Hong Kong (talk)