Actually, I 'discovered' this while using OpenOffice.org, an Open Software Office 'clone' to clean up some data before moving it from an old Library Management System application that used a fixed field length DB system. To get the data into OOo, it had to be exported from the original application in dBase format ( a .dbf file ), which cold then be imported into an OOo spreadsheet (or, I assume into Excel).
After the import, I noticed that the "numbers" had retained their leading zeros, and when I clicked on one the value in the entry bar began with a straight single quote. That led to a little experimentation with Numbers after reading your question, and to the answer I supplied.
Your feedback to Apple makes sense to me.
Thanks for the feedback here.
Regards,
Barry