[Bug 13656] New: variable substitution is broken starting with 1.32.0 when variable is unset

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13656

            Bug ID: 13656
           Summary: variable substitution is broken starting with 1.32.0
                    when variable is unset
           Product: Busybox
           Version: 1.32.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P5
         Component: Standard Compliance
          Assignee: unassigned at busybox.net
          Reporter: risto78 at gmail.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Incorrect Behaviour in 1.32.0
# unset FOO
# echo ${FOO//,/}
/
# echo ${FOO/,/}
/
# echo ${FOO//}

# FOO=
# echo ${FOO//}

# echo ${FOO/,/}

# echo ${FOO//,/}

Correct Behaviour in 1.31.1
# unset FOO
# echo ${FOO//,/}

# echo ${FOO/,/}

# echo ${FOO//}

# FOO=
# echo ${FOO//}

# echo ${FOO/,/}

# echo ${FOO//,/}

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