Library manager mis-sorts (non-semver or with + or - in version?)

[matthijskooijman]

I maintain the LMIC library, and noticed that the library manager does not sort my versions properly. Normally, the newest version is shown at the top, but not here:

I suspect this might be triggered by the + or - present in the version number, but I haven't investigated yet.

[matthijskooijman]

In #10158, @cmaglie said:

About the version numbers I've looked at the SEMVER specification about "build metadata" (i.e. the identfier followed by the + sign), it says:

10. Build metadata MAY be denoted by appending a plus sign and a series of dot separated identifiers immediately following the patch or pre-release version. Identifiers MUST comprise only ASCII alphanumerics and hyphen [0-9A-Za-z-]. Identifiers MUST NOT be empty. Build metadata MUST be ignored when determining version precedence. Thus two versions that differ only in the build metadata, have the same precedence. Examples: 1.0.0-alpha+001, 1.0.0+20130313144700, 1.0.0-beta+exp.sha.5114f85.

So if I read it correctly the precedence between:

• 1.5.0+arduino-0
• 1.5.0+arduino-1
• 1.5.0+arduino-2

is undefined and the IDE theoretically may choose any of those and still be correct...

So the sorting is actually correct and my version numbers are really incorrect. It's a bit of a pity that SEMVER then apparently lacks some expressiveness, but I guess this can be closed.