From 2e0cced64c0ac763492fdd563641264a03364134 Mon Sep 17 00:00:00 2001
From: Kevin Olbrich <kevin.olbrich@gmail.com>
Date: Fri, 30 Dec 2016 18:40:53 -0500
Subject: [PATCH] Remove 'kind_of' method.  It was inconsistent and caused some
 strange problems. Fixes #144 (#150)

---
 Gemfile                         | 2 ++
 lib/ruby_units/unit.rb          | 9 ---------
 spec/ruby_units/complex_spec.rb | 4 ++--
 spec/ruby_units/math_spec.rb    | 2 +-
 4 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/Gemfile b/Gemfile
index 6a2db6d6..e133fc28 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,7 @@
 source 'https://rubygems.org'
 
+ruby RUBY_VERSION
+
 group :development do
   gem 'bundler', '~> 1.0'
   gem 'guard-rspec'
diff --git a/lib/ruby_units/unit.rb b/lib/ruby_units/unit.rb
index a45fc733..8e559f31 100644
--- a/lib/ruby_units/unit.rb
+++ b/lib/ruby_units/unit.rb
@@ -426,15 +426,6 @@ def self.use_definition(definition)
     # @return [String]
     attr_accessor :unit_name
 
-    # needed to make complex units play nice -- otherwise not detected as a complex_generic
-    # @param [Class]
-    # @return [Boolean]
-    def kind_of?(klass)
-      # rubocop:disable Style/ClassCheck
-      scalar.kind_of?(klass)
-      # rubocop:enable Style/ClassCheck
-    end
-
     # Used to copy one unit to another
     # @param [Unit] from Unit to copy definition from
     # @return [Unit]
diff --git a/spec/ruby_units/complex_spec.rb b/spec/ruby_units/complex_spec.rb
index af7ff923..82bb89c5 100644
--- a/spec/ruby_units/complex_spec.rb
+++ b/spec/ruby_units/complex_spec.rb
@@ -12,8 +12,8 @@
 describe 'Complex Unit' do
   subject { Complex(1.0, -1.0).to_unit }
 
-  it { is_expected.to be_instance_of Unit }
-  it(:scalar) { is_expected.to be_kind_of Complex }
+  it { is_expected.to be_a Unit }
+  it { expect(subject.scalar).to be_a Complex }
 
   it { is_expected.to eq('1-1i'.to_unit) }
   it { is_expected.to be === '1-1i'.to_unit }
diff --git a/spec/ruby_units/math_spec.rb b/spec/ruby_units/math_spec.rb
index e33ceeaf..f7f65922 100644
--- a/spec/ruby_units/math_spec.rb
+++ b/spec/ruby_units/math_spec.rb
@@ -4,7 +4,7 @@
   describe '#sqrt' do
     specify { expect(Math.sqrt(RubyUnits::Unit.new('1 mm^6'))).to eq(RubyUnits::Unit.new('1 mm^3')) }
     specify { expect(Math.sqrt(4)).to eq(2) }
-    specify { expect(Math.sqrt(RubyUnits::Unit.new('-9 mm^2'))).to be_kind_of(Complex) }
+    specify { expect(Math.sqrt(RubyUnits::Unit.new('-9 mm^2')).scalar).to be_kind_of(Complex) }
   end
 
   describe '#cbrt' do