mysql2 gemspec problems

gistfile1.txt

this doesnt work:

$ gem spec mysql2 --version "0.2.7" --remote
  ERROR:  Unknown gem 'mysql2'

this works:

$ gem spec mysql2 --remote
--- !ruby/object:Gem::Specification 
name: mysql2
version: !ruby/object:Gem::Version 
  hash: 23
  segments: 
  - 0
  - 3
  - 2
  version: 0.3.2
...truncated

this indicates to me that both should work:

$ gem list -ar mysql2

*** REMOTE GEMS ***

mysql2 (0.3.2, 0.3.1, 0.3.0, 0.2.7, 0.2.6 ruby x86-mingw32 x86-mswin32-60, 0.2.5, 0.2.4, 0.2.3, 0.2.2, 0.2.1, 0.2.0, 0.1.9, 0.1.8, 0.1.7, 0.1.6, 0.1.5, 0.1.4, 0.1.3, 0.1.2, 0.1.1, 0.1.0)