bits 0..5: base type 
bits 6..7: const & volatile bits 
bit 8: 'is_typeref' bit 
bits 9..63: type detail idx 
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const int  | FIRST_NONTRIVIAL_TYPID = 0x100 | 
|   | Denotes the first bit describing a nontrivial type. 
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const int  | TYPID_ISREF = 0x100 | 
|   | Identifies that a type that is a typeref. 
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const int  | TYPID_SHIFT = 9 | 
|   | First type detail bit. 
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