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Edward Z. Yang authored
This module defines the key data types 'IndefUnitId' and 'IndefModule', which represent components which are partially instantiated with holes in them. The intent is that they can be substituted over (Distribution.Backpack.ModSubst), and once all the holes are filled they can be improved into proper 'UnitId's, which can then be installed. Also add Distribution.Util.Base62 module containing an implementation of base-62 encoding, which we use when computing hashes for fully instantiated unit ids.
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