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Rather than using underscores in your versions, there are other mechanisms to indicate a development or trial release of a distribution that don't involve module versions. If the archive file uploaded to CPAN has a name ending in -TRIAL (before the file extensions), PAUSE will not index it as a stable release. Additionally, you can set the release_status metadata field in meta-spec 2; a value of "testing" or "unstable" will indicate that the release should not be indexed. The method of setting this depends on your authoring tool. At the time of writing, either of these methods is sufficient to prevent PAUSE from indexing the distribution, and both are performed automatically by the "--trial" option when releasing using Dist::Zilla or Minilla.
While decimal number versions are a simple concept, they are different from the versions used by most everything outside of Perl. For that, Perl recognizes a second type of version: a tuple (or sequence) of integers separated by dots, sometimes referred to as "dotted-decimal" versions, and used for the concept of semantic versioning. These look like 'v1.2.3' and 'v0.0.30'. For these versions, each segment is an integer, so trailing zeroes are significant -- 'v1.2.3' is the same version as 'v1.02.03', but not the same as 'v1.20.30'. Each segment after the first must also be 999 or lower, to allow conversion as described in the next section.
Version numbers in Perl are very important; they allow orderly updating and maintenance of modules and distributions across the CPAN, and allow CPAN modules and consumers to require the versions of modules with the bugfixes or features they need. However, in this context, they are also a very unique beast with a complex and bumpy history that leads to some surprises for those who are not familiar with the nuances. These are the things CPAN authors should know about versions in Perl, and are nice for consumers to know as well.