Here&#x27;s a good guide to which ones are benign &#x2F; dangerous and what they are for: <a href="http:&#x2F;&#x2F;dev.stephendiehl.com&#x2F;hask&#x2F;#language-extensions" rel="nofollow">http:&#x2F;&#x2F;dev.stephendiehl.com&#x2F;hask&#x2F;#language-extensions</a>