* Not a dictionary, so assume (and convert to, for backward-
	 * -compatibility reasons) a list.
	 */

	size_t elemLen;
	Tcl_Obj **elemPtrs, *copyListObj;

	result = TclListObjLengthM(interp, arrayElemObj, &elemLen);

	if (result != TCL_OK) {
	    return result;
	}
	if (elemLen & 1) {
	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
		    "list must have an even number of elements", -1));
	    Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "FORMAT", NULL);
	    return TCL_ERROR;
	}
	if (elemLen == 0) {
	    goto ensureArray;
	}
	result = TclListObjGetElementsM(interp, arrayElemObj,
		&elemLen, &elemPtrs);
	if (result != TCL_OK) {
	    return result;
	}

	/*
	 * We needn't worry about traces invalidating arrayPtr: should that be
	 * the case, TclPtrSetVarIdx will return NULL so that we break out of
	 * the loop and return an error.
	 */