lisp/emacs-lisp/eieio*.el: Reduce object header to 1 slot
* lisp/emacs-lisp/eieio-core.el (eieio--with-scoped-class): Use let-binding. (object): Remove first (constant) slot; rename second to `class-tag'. (eieio--object-class-object, eieio--object-class-name): New funs to replace eieio--object-class. (eieio--class-object, eieio--class-p): New functions. (same-class-fast-p): Make it a defsubst, change its implementation to check the class objects rather than their names. (eieio-object-p): Rewrite. (eieio-defclass): Adjust the object initialization according to the new object layout. (eieio--scoped-class): Declare it returns a class object (not a class name any more). Adjust calls accordingly (along with calls to eieio--with-scoped-class). (eieio--slot-name-index): Rename from eieio-slot-name-index and change its class arg to be a class object. Adjust callers accordingly. (eieio-slot-originating-class-p): Make its start-class arg a class object. Adjust all callers. (eieio--initarg-to-attribute): Rename from eieio-initarg-to-attribute. Make its `class' arg a class object. Adjust all callers. * lisp/emacs-lisp/eieio-base.el (eieio-persistent-validate/fix-slot-value): Use eieio--slot-name-index rather than eieio-slot-name-index. * lisp/emacs-lisp/eieio.el (child-of-class-p): Make it accept class objects additionally to class names. * test/automated/eieio-test-methodinvoke.el (eieio-test-method-store): Adjust to new semantics of eieio--scoped-class. (eieio-test-match): Improve error feedback.
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