[MERGE] Support old API properly

[Aaron Bentley]

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Hi all,

My last work on making roots less weird introduced a regression.  It was
meant to make the old API deprecated, but instead, made an assertion
fail.  Unfortunately, that case wasn't exercised by the test suite, so I
missed it.

This patch addresses that case, and introduces a test case to cover it.
 That test case emits a deprecation warning, but I don't see any
alternative, because the deprecated API is what I'm testing.

Aaron
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