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Made the fact that properties belong to an attribute shine through to
scheme. This by setting the SCM field in the strbuf:ers in my
vcomponents to a pair of their old SCM value, and a hash table
representing the properties.
This also meant that the primitive set-attribute! could be replaced by a
set-car! on the pair returned by the primitive get-attribute. And that
both set- and get-property now simple works on the hash table returned
by get-attribute.
The major problem with this release was that I for a while missed that
DEEP_COPY(strbuf) now also needed to deep copy the SCM values. Without
that attributes in a copied vcomponent would be shared with the
original. This mainly lead to repeating events all being the same.
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