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typeparam keywords
------------------
slot
typeslot
typevar
genericslot
genericvar
typeparam
generic
type
variant
typename
type32
T,U,...
%
ref_or_int
Slot types
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A slot type can accept any of the following types:
ref,string
?ref,?string
byte,int8,wuint8
int16,uint16,wuint16
int32,uint32,wuint32 - unless \option allow16 is in use
int,uint,wuint
(int64,uint64,wuint64) - only if \option use64 is in use
And maybe:
float32 - but float64 will not work without \option use64
16-bit and 64-bit override
--------------------------
\option allow16 - int/ref/slot can be 16 bit. affects maximum value.
\option use64 - slot types can accept int64, but will use 64 bits
even on 32 bit platforms. Note that this breaks ABI!
use64 should perhaps introduce a new slot keyword, perhaps "slot64"?
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