[Chicken-janitors] #473: guard-procedure should not be reinvoked when restoring parameter value using `parameterize'

[Chicken Trac]

#473: guard-procedure should not be reinvoked when restoring parameter value
using `parameterize'
----------------------------+-----------------------------------------------
 Reporter:  felix           |       Owner:  felix
     Type:  defect          |      Status:  new  
 Priority:  major           |   Milestone:  4.7.0
Component:  core libraries  |     Version:  4.6.x
 Keywords:  parameterize    |  
----------------------------+-----------------------------------------------
 (This was reported by Joo ChurlSoo)

 Restoring the old value after execution of the body of a `parameterize`
 form will reinvoke the guard, which is incorrent, if it performs a
 conversion (for example `number->string`).

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Ticket URL: <http://bugs.call-cc.org/ticket/473>
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