1 files changed, 10 insertions, 11 deletions
diff --git a/lib/bundler/lazy_specification.rb b/lib/bundler/lazy_specification.rb
index 7b1d28b0c3..1081910816 100644
--- a/lib/bundler/lazy_specification.rb
+++ b/lib/bundler/lazy_specification.rb
@@ -4,7 +4,7 @@ require_relative "match_platform"
 
 module Bundler
   class LazySpecification
-    Identifier = Struct.new(:name, :version, :source, :platform, :dependencies)
+    Identifier = Struct.new(:name, :version, :platform)
     class Identifier
       include Comparable
       def <=>(other)
@@ -108,7 +108,7 @@ module Bundler
     end
 
     def identifier
-      @__identifier ||= Identifier.new(name, version, source, platform, dependencies)
+      @__identifier ||= Identifier.new(name, version, platform)
     end
 
     def git_version
@@ -131,17 +131,16 @@ module Bundler
     end
 
     #
-    # Bundler 2.2.0 was the first version that records the full resolution
-    # including platform specific gems in the lockfile, which means that if a
-    # gem with RUBY platform is recorded, the RUBY platform version of the gem
-    # should be installed. Previously bundler would record only generic versions
-    # in the lockfile and then install the most specific platform variant if
-    # available.
+    # For backwards compatibility with existing lockfiles, if the most specific
+    # locked platform is RUBY, we keep the previous behaviour of resolving the
+    # best platform variant at materiliazation time. For previous bundler
+    # versions (before 2.2.0) this was always the case (except when the lockfile
+    # only included non-ruby platforms), but we're also keeping this behaviour
+    # on newer bundlers unless users generate the lockfile from scratch or
+    # explicitly add a more specific platform.
     #
     def ruby_platform_materializes_to_ruby_platform?
-      locked_bundler_version = Bundler.locked_bundler_version
-
-      locked_bundler_version.nil? || Gem::Version.new(locked_bundler_version) >= Gem::Version.new("2.2.0")
+      !Bundler.most_specific_locked_platform?(Gem::Platform::RUBY)
     end
   end
 end