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Fixes #10047.

Fixes #10046.

Fixes #10043.

Fall-out from the operator assignment type checker.

Fixes #10042.

* patches/bug10033-fallout:
  Protocols.HTTP.Server: Fixed bug in Request()->update_mime_var().

Detected by the type-checker for +=.

Fall-out from fixing bug #10033.

low_get_f_name() is only present --with-debug...

Fixes most of bug #10033.

Attempting to get a constant from an expression like

  ({ "abc", "cde" })[*]

is not possible and generates the compilation error
"[*] not supported here", so don't attempt to.

Fixes #10039.

This helps the module dumper to do the right thing when encountering
8.0::Crypto.CBC or 8.0::Crypto.Buffer.

Fixes #10037.

If the mutex was already locked when lock() was called in a
threads_disabled context, the wait count was increased but
no corresponding wait was performed.

Also fixes a reference leak on error in shared_lock().

If the current thread already holds a shared lock, a new one
is created without waiting. This avoids some dead locks.

Mutex locks are now taken in the same order as the calls to lock().
This prevents potential starvation.

Also adds Thread.RWKey()->try_upgrade().

The 'last_key' field was not used for anything, and not kept
consistent, so remove it.

Also renames 'first_key' to 'key'.

Candidate for backport to 8.0.

Adds upgrade() and downgrade() to the fallback implementation.

Improved API-compat with the C-version.

Avoid mutex operations in destruction callbacks.

Also improved compat with semi-old versions of Pike.