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<appendix>
<title>Bugs</title>
<itemizedlist>
<listitem>
<para>
Nix should automatically recover the Berkeley DB database.
</para>
</listitem>
<listitem>
<para>
Nix should automatically remove Berkeley DB logfiles.
</para>
</listitem>
<listitem>
<para>
Unify the concepts of successors and substitutes into a general notion
of <emphasis>equivalent expressions</emphasis>. Expressions are
equivalent if they have the same target paths with the same
identifiers. However, even though they are functionally equivalent,
they may differ stronly with respect to their <emphasis>performance
characteristics</emphasis>. For example, realising a slice is more
efficient that realising the derivation from which that slice was
produced. On the other hand, distributing sources may be more
efficient (storage- or bandwidth-wise) than distributing binaries. So
we need to be able to attach weigths or priorities or performance
annotations to expressions; Nix can then choose the most efficient
expression dependent on the context.
</para>
</listitem>
</itemizedlist>
</appendix>
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