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### New unique package
The new [unique](/pkg/unique) package provides facilities for
canonicalizing values (like "interning" or "hash-consing").
Any value of comparable type may be canonicalized with the new
`Make[T]` function, which produces a reference to a canonical copy of
the value in the form of a `Handle[T]`.
Two `Handle[T]` are equal if and only if the values used to produce the
handles are equal, allowing programs to deduplicate values and reduce
their memory footprint.
Comparing two `Handle[T]` values is efficient, reducing down to a simple
pointer comparison.
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