Branko Čibej wrote on Tue, Oct 18, 2016 at 13:08:37 +0200:
> It is. I don't think there's any way we can /not/ make it backwards
> incompatible, given the current implementation. Which is why I think we
> should just admit that current behaviour is a bug.
> Either that, or introduce a new property that behaves sensibly.

Some IRC discussion lead us to svn_prop_name_is_valid(), which requires
that the first character of a property name be alphabetic or colon or

Brane therefore proposes «*.txt == propname=propval» for the "override"
syntax, and keep «*.txt = propname=propval» for the "overlay" syntax.

This change would be backwards compatible: this syntax does not have
a meaning currently.  1.9 clients just ignore it.

We can bikeshed about finding a syntax that looks less like
a C comparison, of course.  We can't use =: because property names can
start with a colon, we can't use := because filename patterns can end
with a colon, but any other option is open.

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