Fixed bug with Hash/Set initialization
Fixed bug with Hash/Set initialization

This was caused when I removed Trie::Entry and started using Arrays
instead. The symptoms were that elements with similar hash codes
would overwrite each other IF: they were both Hash K/V pairs with the
same value, OR it was a 'nil' Set element.

xaviershay/hamster,jack-nie/hamster,dzjuck/hamster