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Attempt to avoid using verbatim magical constants.

This simplifies the code for promises that do not use aggregation,
and avoids bugs when aggregation functions are used in combination
with non-aggregation functions.

The lfun_names table was not in sync with the LFUN enum.

This caused eg some operations on bignum objects to behave in
unexpected ways.

Fixes build issues on 32-bit architectures.

Add the missing iterator lfuns to the old-style lfun lookup method.

All iterator API functions may now be declared protected.

* tobij/fix-compiler-car-cdr-f-assign-swap-omittance:
  Compiler: Complete missed CAR/CDR swap in F_GET_SET nodes

This was somehow missed in a1af3077, and
broke setters somewhat.

It seems to cause the testsuite to hang.

* Protect against infinite recursion.

* Perform proper checking of transitive types (via expand_transitive()).

Get rid of multiple cases of circular referencing via AggregateState.

Removes the AggregateState class.

The folding function no longer gets called with failure values.

The successful array result no longer contains failed values.

References between Promises and Futures should now strictly be only
in the result notification direction.

API-compatible, user level code should not notice any differences.

Now that low_match_types() adds a reference to its result, we can
return the matching types for both parts of a union type.

Adjust type to match actual use (cf eg Element()->get_elements_by_tag_name()).

Fixes compilation error.

low_match_types() now adds a reference to the returned type. This fixes
potential issues with matching PIKE_T_OPERATOR and similar, where it
could return a freed type.

present in the file.

Preparation for having low_match_types() add a reference to
its return value.

With the addition of partially expanded types low_match_types()
is at risk of infinite recursion.

* patches/is220:
  Tools.Standalone.features: Added check for SQLite.

* patches/bug10051:
  Protocols.DNS.async_client: Survive NULL callbacks.

Do not complain if the callback function has become NULL when
it is time to call it (the initiator may have gone away).

Fixes #10051.

This is a helper type to construct the type for transitive left-
recursive functions (like eg many operator efuns).