Why zone files on slave Bind DNS server are not human-readable now as they were before?

Solution Verified - Updated -

Issue

The zone files on the slave Bind DNS server are presented in an unreadable way if one opens them using a text editor.
How to make them readable?
How to make Bind use old text human-readable format for the slave zone files?

Environment

Red Hat Enterprise Linux 5, 6
Bind 9.9 and later

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