ruby - Why does the Gemfile semantic versioning operator (~>) produce inconsistent results with one number? -

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the gemspec semantic versioning operator ~> (aka twiddle-wakka, aka pessimistic operator) allows gem version constrained yet allow upgrades.

i have seen can read as:

 "~> 3.1"   => "any version 3.x, @ least 3.1"  "~> 3.1.1" => "any version 3.1.x, @ least 3.1.1"

but 1 number, rule breaks down:

 "~> 3"     => "any version x, @ least 3"   *not true!*  "~> 3"     => "any version 3.x"                 *true. why?*

if wanted "any version 3.x", use "~> 3.0", consistent. stands, change of operation @ 1 number inconsistent , undocumented.

moreover, if wanted "any version higher or equal 3" (so 3.x, 4.x etc...) tempted use ">=" operator, told is evil.

is there reason behaviour?

edit:

i'm giving david finding culprit file in rubygems. there "feature" silently expands "3" "3.0" (line 148 in version.rb: "single-digit versions automatically extended 0 give sensible result.")

i must disagree result sensible, breaks expected sequence, , prevents being able "any version x, @ least 3" operator. thus, forced onto >= guides.rubygems.org warns not use. anyway. maybe post serve documentation i'd been looking for...

by peeking rubygems sources (esp. requirement.rb, version.rb) pessimistic operator needs @ least 2 versioning segments.

it make sense. ~> v.r syntactic sugar inequality

v.r <= current_version.current_release < (v+1).0

what upper bound if there 1 version number ? yep, ∞ (infinity), there no point why should work. can write >= v .


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