coleifer/peewee 4.2.2

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• Change Field.__hash__ again... fml. Use (model_cls, field name).
• Fix Metadata.remove_ref() removing the wrong foreign-key when a model has multiple foreign-keys to the same target, as list.remove() matched the first entry via the overloaded Field.__eq__.
• Fix a scalar subquery nested inside a function, Case or Cast collapsing to its alias in an UPDATE ... SET value and in ON CONFLICT DO UPDATE, as qualify_names() wrapped the value at SCOPE_COLUMN.
• Fix namedtuples() on a query-builder (Table) query raising ValueError when a column name is not a valid identifier. The plain NamedTupleCursorWrapper now passes rename=True, matching the model path.
• Fix outer joins in a joined model graph not hydrating a missing related object as None, so accessing the attribute raised AttributeError. The outer-join test had regressed to endswith('OUTER') (never true). It now also recognizes FULL JOIN and LEFT JOIN LATERAL.
• Fix ModelSelect.select_extend() mutating its receiver's default-projection flag, so a base Model.select() reused as a subquery stopped collapsing to its primary key. It now flags the returned clone, matching select().
• Fix distinct(True) and distinct(False) not clearing a prior distinct(*columns), so the query kept rendering DISTINCT ON (...) instead of a plain DISTINCT or no distinct at all.
• Fix Postgres get_indexes() shredding an expression index whose key contains a comma, e.g. COALESCE(a, 0) split into two bogus columns. It joined the per-key definitions into a comma-delimited string and split on the comma. It now reads the key array directly.
• Fix an empty insert (Model.insert(), insert({})) emitting DEFAULT VALUES and dropping python-side field defaults, inconsistent with a partial insert which backfills them. A model with no python defaults still uses DEFAULT VALUES.

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