removed standard reference #130

Job	Run time
ubuntu-latest 3.4	21s
ubuntu-latest 3.3	30s
ubuntu-latest 3.2	22s
ubuntu-latest 3.1	26s
ubuntu-latest 3.0	25s
ubuntu-latest 2.7	38s
ubuntu-latest 2.6	35s
ubuntu-latest 2.5	30s
ubuntu-latest 2.4	30s
ubuntu-latest head	20s
ubuntu-latest jruby	46s
ubuntu-latest jruby-head	47s
ubuntu-latest truffleruby	29s
ubuntu-latest truffleruby-head	36s
macos-latest 3.4	17s
macos-latest 3.3	18s
macos-latest 3.2	18s
macos-latest 3.1	20s
macos-latest 3.0	17s
macos-latest 2.7	28s
macos-latest 2.6	44s
macos-latest 2.5	6s
macos-latest 2.4	5s
macos-latest head	21s
macos-latest jruby	28s
macos-latest jruby-head	29s
macos-latest truffleruby	31s
macos-latest truffleruby-head	23s
windows-latest 3.4	2m 0s
windows-latest 3.3	1m 51s
windows-latest 3.2	1m 33s
windows-latest 3.1	1m 2s
windows-latest 3.0	1m 29s
windows-latest 2.7	2m 9s
windows-latest 2.6	2m 27s
windows-latest 2.5	2m 39s
windows-latest 2.4	1m 22s
windows-latest head	1m 16s
windows-latest jruby	1m 46s
windows-latest jruby-head	1m 15s
	33m 9s

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