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<p>but specifying the types of variables or method arguments is generally unneeded. Types are resolved by an advanced global <a href="page.php?w=type_inference">type inference</a> algorithm. Crystal is currently in active development. It is released as <a href="page.php?w=free_and_open-source_software">free and open-source software</a> under the <a href="page.php?w=Apache_License">Apache License</a> version 2.0.</p>

<p><big> History </big></p>
<p>Work on the language began in June 2011, with the aim of merging the elegance and productivity of <a href="page.php?w=Ruby_%28programming_language%29">Ruby</a></p><p>
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