Reduce allocations in dependency construction

By always passing around a single, unnested array rather than splatting
and then defensively flattening and compacting things, we can avoid
allocating a bunch of unnecessary arrays. This gives a performance boost
of roughly 4% when enumerating 2500 formulae, and has the side effect of
cleaning up the dependency API.

1 files changed, 2 insertions, 2 deletions

diff --git a/Library/Homebrew/dependency.rb b/Library/Homebrew/dependency.rb
index 34320a31b..6c78e10ac 100644
--- a/Library/Homebrew/dependency.rb
+++ b/Library/Homebrew/dependency.rb
@@ -6,9 +6,9 @@ class Dependency
 
   attr_reader :name, :tags
 
-  def initialize(name, *tags)
+  def initialize(name, tags=[])
     @name = name
-    @tags = tags.flatten.compact
+    @tags = tags
   end
 
   def to_s