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+++ b/lib9p/idl/0000-README.md
@@ -54,6 +54,10 @@ can be
- `&fieldname` to refer to the offset of a field name in that struct,
- the special value `end` to refer to the offset of the end of the
struct,
+ - the special value `s32_max` to refer to the constant value
+ `(1<<31)-1`, or
+ - the special value `s64_max` to refer to the constant value
+ `(1<<63)-1`
A parser for this syntax is given in `__init__.py`. However,
`__init__.py` places the somewhat arbitrary undocumented restrictions