Type of a shader keyword, eg: built-in or user defined.
See Also: ShaderKeyword.
| None | No type is assigned. | 
| BuiltinDefault | The keyword is built-in the runtime and it is systematically reserved. | 
| BuiltinExtra | The keyword is built-in the runtime and it is optionally reserved depending on the features used. | 
| BuiltinAutoStripped | The keyword is built-in the runtime and can be automatically stripped if unusued. | 
| UserDefined | The keyword is defined by the user. | 
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