Illegal Filesystem characters in revision names

[Aaron Bentley]

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Robert Collins wrote:
| My preference is to escape characters we dont want, which could be
| anything outside the legitimate URL character set (i.e. all non-7bit
| ascii characters and some of those too). This makes it as simple as
| possible for interoperation with other systems that have an analagous
| concept. I.e. to convert CVS one might use the CVS repository prefix +
| the dotted decimal revision to create a bzr rev id.

I agree.  I'd add that using the filesystem naming restrictions feels to
me like a very leaky abstraction, and a very ill-defined one.  It
sacrifices utility and predictability for ease-of implementation.

Having an irregular system like this forces other layers to do encoding
and decoding, violating DRY.

Aaron
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