Use universal visitors for const-ref saving #46
Merged
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See jermp/pthash#65 and jermp/essentials#9. If those two are merged, the changes would also need to be propagated to sshash. This will allow to use const-ref instead of simple ref for saving, which is good and important for third-party users.
Note: Submodule pthash needs to be updated in the PR before actually merging this change.