In the course of refactoring, recently, @WrathfulSpatula failed to test QBdt (QBDD), and, likely, a long-standing pattern of free-then-use-copy became a use-after-free anti-pattern. As can be seen in the diff and tests of the affected versions, it seems unlikely that this very tight pattern of use-after-free would not go uncaught by the runtime, ever. This has been fixed.

Experimental support for "automatic circuit elision" (ACE) interoperability with QBdt has also been added. (While QBdt works in principle with SDRP, for example, the stability of this interoperability with high SDRP settings has historically been limited, maybe due to complex recursive behavior wholly on stack, by design of QBdt.)

(To break it down simply and colloquially: I realize these release notes sound like "WTF?" if you haven't used Qrack or QBdt before, but the long-and-short is, I've fixed the regression that broke QBdt in recent releases, since refactoring for general best-practice, and the ACE interoperability with QBdt should work in principle, but the "instability" with approximation techniques is nothing new for QBdt, though you're free run stable ideal QBdt simulation or experiment with combining it with approximation techniques, like status quo. You might want to use small-magnitude approximation parameters with QBdt, per usual.)

Full Changelog: vm6502q.v9.14.1...vm6502q.v9.15.0

sha1sum results:
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