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<span class="ruby-constant">Utility</span><span class="ruby-operator">::</span><span class="ruby-identifier">check_types</span>({ <span class="ruby-identifier">expr</span>=<span class="ruby-operator">></span><span class="ruby-constant">String</span> }) <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">$DEBUG</span>
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<span class="ruby-identifier">expr</span> = <span class="ruby-identifier">expr</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp re">/[ \t\r\n\v\f]+/</span>, <span class="ruby-value str">" "</span>)
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<span class="ruby-keyword kw">end</span></pre>