Fix-N format first byte.
@:value(cast 0x90)@:enum@:implinlineread onlyFixarray:VariableFormatByte = 0x90
@:value(cast 0x80)@:enum@:implinlineread onlyFixmap:VariableFormatByte = 0x80
@:value(cast 0xa0)@:enum@:implinlineread onlyFixstr:VariableFormatByte = 0xa0
@:value(cast 0xe0)@:enum@:implinlineread onlyNegativeFixint:VariableFormatByte = 0xe0
@:value(cast 0x00)@:enum@:implinlineread onlyPositiveFixint:VariableFormatByte = 0x00