[merge] cache encoding

[Robert Collins]

On Fri, 2006-08-18 at 16:54 +1000, Martin Pool wrote:
> 
> I'd really rather not allow arbitrary non-utf-8 binary, just because
> it
> will cause trouble if we ever do need to decode them.  And the general
> policy is that strings are Unicode, so defining some strings to be
> 8-bit binary is just asking for trouble.
> 
> Of course having them stay in utf-8 and be treated by the program as
> byte string as an optimization is totally fine.  But the interface
> requirement is that they're utf-8. 

We can change the interface: but we need to define that the existing
utf8 strings will be considered bytestrings - at a minimum its going to
mean a code audit.

-Rob
-- 
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