Fix bug #79108

Don't expose references in debug_backtrace() or exception traces.
This is regardless of whether the argument is by-reference or not.

As a side-effect of this chan

Fix bug #79108

Don't expose references in debug_backtrace() or exception traces.
This is regardless of whether the argument is by-reference or not.

As a side-effect of this change, exception traces may now acquire
the interior value of a reference, which may be unexpected for
some internal functions. This is what necessitated the change in
the spl_array sort implementation.

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