Incorrect Ranges overlap and identical boundaries error while parsing maven version range

[keshav-space]

>>> from univers.version_range import MavenVersionRange
>>> MavenVersionRange.from_native("[3.0.0,3.1.1),(,2.3.4)")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "../univers/version_range.py", line 784, in from_native
    restrictions = maven.VersionRange(string).restrictions
  File "../univers/maven.py", line 226, in __init__
    raise VersionRangeParseError("Ranges overlap: %s" % spec)
univers.maven.VersionRangeParseError: Ranges overlap: [3.0.0,3.1.1),(,2.3.4)

>>> from univers.version_range import MavenVersionRange
>>> MavenVersionRange.from_native("[5.0,5.0]")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "../univers/version_range.py", line 784, in from_native
    restrictions = maven.VersionRange(string).restrictions
  File "../univers/maven.py", line 219, in __init__
    restriction = Restriction(_spec[0 : close + 1])
  File "../univers/maven.py", line 81, in __init__
    raise RestrictionParseError("Range cannot have identical boundaries: %s" % spec)
univers.maven.RestrictionParseError: Range cannot have identical boundaries: [5.0,5.0]

• Also see Error while collecting Maven advisories from GitLab vulnerablecode#1578

[PlayerIUnknown]

Hi, I am working on this issue and have solved the 'identical boundaries' bit. Just wanted to get some more information about what do you think is causing the 'range overlap' issue? I will add a PR once I fix both the mentioned errors.