memo does not accept array

Stream.scan(memo, iterator)
looks like memo is forced to accept string and buffer, any suggestion or work around to make "memo" accept an array

The issue names Stream.scan(memo, iterator), so start by locating that entry point and reproducing the array-memo case. Trace how memo is handled for string and buffer values, then check the related tests. Done means the intended array behavior is covered by a test and the accepted behavior or workaround is clear.

Written by the indexing model from the issue text.