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Default value of :USE for DEFPACKAGE is implementation dependent.
この状態ではcl:in-packageがパッケージFOOにinternされていないからです.
可搬的に:CLを使わないPACKAGEを定義したい場合は明示的に(:USE)と指定すればokです。
ちなみに処理系は何をお使いでしょうか？
FOO> (defun + (&rest numbers) (declare (ignore numbers)) 0)
WARNING: redefining COMMON-LISP:+ in DEFUN
+
これも処理系によりけりで、PACKAGE-LOCK機構を持つ処理系ならエラーになるようです。
（具体的には少なくともSBCLではエラー。）
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