$ perl5.10.0 -e 'use Foo 0.000001'
Foo version 0.000001 required--this is only version v0.0_1 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl5.10.0 -e 'use Foo v0.0_1'

$ perl5.8.9 -e 'use Foo v0.0_1'

$ perl5.8.0 -e 'use Foo v0.0_1'
Foo version v0.0.1 required--this is only version v0.0_1  at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl5.6.2 -e 'use Foo v0.0_1'
Foo version 0.001 required--this is only version v0.0_1  at -e line 1.
BEGIN failed--compilation aborted at -e line 1.