Replace "iff" with "if and only if"

iff means if and only if, but readers without that knowledge might
assume this to be a spelling mistake. To me, this seems like
exclusionary language that is unnecessary. Simply using "if and only if"
instead should suffice.

1 files changed, 1 insertions, 1 deletions

diff --git a/spec/ruby/core/hash/shared/eql.rb b/spec/ruby/core/hash/shared/eql.rb
index d8c33179fc..e294edd764 100644
--- a/spec/ruby/core/hash/shared/eql.rb
+++ b/spec/ruby/core/hash/shared/eql.rb
@@ -118,7 +118,7 @@ describe :hash_eql_additional, shared: true do
     { 1.0 => "x" }.send(@method, { 1 => "x" }).should be_false
   end
 
-  it "returns true iff other Hash has the same number of keys and each key-value pair matches" do
+  it "returns true if and only if other Hash has the same number of keys and each key-value pair matches" do
     a = { a: 5 }
     b = {}
     a.send(@method, b).should be_false