Clojure: why does (into {} '( (1 2) (3 4))) fail? -

I understand that the closure lists and vectors are mostly interchangeable and work as a sequence of order using one or the other The lack of need to bid in conj or in the case of a vector.

Then why

  ({} in () ((1 2 (3) 4)   
 fail, while < / P> 
  (in {} '([1 2] [3 4]))   
 is successful?   
 
 This is an artwork of how a map has been implemented.  
 The map is conceptually written by many codes in the  Java.util.Map.Entry . It is that special case code for treating length 2 vectors in a map entry (in epicestiastemapacans) But not for lists.  
 It is a proper matter to give distractions to this special treatment, because they are convenient features for representing map entry written words in the code. You can write stuff:  
  (conj {} [: a 1]) => {: 1}