note
fergal
TS is the strictest possible comparison that doesn't involve comparing reference addresses, so if <code>$x=[];$y=[]</code> then TS will say that <code>[$x,$x]</code> is not the same as <code>[$x,$y]</code> because one is an array with 2 refs to 1 array and the other has refs to 2 different arrays. This is a valid difference. TD ignores this difference. TD also lets you do something a little bit like regular expressions for data structures.
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