Commits on Oct 26, 2017

1. Add constant for default content_tag_with_haml options …

   This saves an array allocation each time the method is called.
   
   ```ruby
   begin
     require "bundler/inline"
   rescue LoadError => e
     $stderr.puts "Bundler version 1.10 or later is required. Please update
                   your Bundler"
     raise e
   end
   
   gemfile(true) do
     source "https://rubygems.org"
   
     gem "benchmark-ips"
     gem "rails"
   end
   
   def allocate_count
     GC.disable
     before = ObjectSpace.count_objects
     yield
     after = ObjectSpace.count_objects
     after.each { |k,v| after[k] = v - before[k] }
     after[:T_HASH] -= 1 # probe effect - we created the before hash.
     GC.enable
     result = after.reject { |k,v| v == 0 }
     GC.start
     result
   end
   
   DEFAULT_PRESERVE_OPTIONS = %w(textarea pre code).freeze
   @hash = {}
   
   def master_version
     {}.fetch(:preserve, %w(textarea pre code))
   end
   
   def fast_version
     {}.fetch(:preserve, DEFAULT_PRESERVE_OPTIONS)
   end
   
   puts "master_version"
   puts allocate_count { 1000.times { master_version } }
   puts "fast_version"
   puts allocate_count { 1000.times { fast_version } }
   
   Benchmark.ips do |x|
     x.report("master_version") { master_version }
     x.report("fast_version")     { fast_version }
     x.compare!
   end
   ```
   
   ```ruby
   master_version
   {:FREE=>-1812, :T_STRING=>52, :T_ARRAY=>1000, :T_HASH=>1000}
   fast_version
   {:FREE=>-1001, :T_HASH=>1000}
   Warming up --------------------------------------
         master_version   127.040k i/100ms
           fast_version    79.789k i/100ms
   Calculating -------------------------------------
         master_version      3.310M (±35.6%) i/s -     13.212M in   5.007796s
           fast_version      5.899M (±19.3%) i/s -     28.166M in   5.016644s
   
   Comparison:
           fast_version:  5899290.2 i/s
         master_version:  3310098.8 i/s - 1.78x  slower
   ```
   
   Results of `benchmark.rb`
   ```
                                            Haml |     ERB |  Erubis |
   -------------------------------------------------------------------
   Cached                                  0.089 |   0.080 |   0.062 |
   ActionView                             18.273 |  12.743 |         |
   ActionView with deep partials          44.632 |  43.307 |         |
   ```
   
   compared to current master:
   ```
                                            Haml |     ERB |  Erubis |
   -------------------------------------------------------------------
   Cached                                  0.174 |   0.420 |   0.224 |
   ActionView                             21.360 |  11.631 |         |
   ActionView with deep partials          43.563 |  39.238 |         |
   ```

   

   dillonwelch committed Oct 26, 2017
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   fddafab View commit details

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2. Merge branch 'master' into default_preserve_options

   

   amatsuda committed Oct 26, 2017
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   b3963a3 View commit details

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