format ~$ may need consider -0.0

"dingd" <[email protected]> Mon, 11 Mar 2019 13:34:21 +0800

Newsgroups	gmane.editors.j.devel
Message-ID	<tencent_6D6CB1B0F5E0965BBE087B7DD9DC2EE3120A__25818.6868437164$1552285428$gmane$org@qq.com>

this is what sbcl does

* (format nil "~$" -0.0)
"-0.00"

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