`ideque=``elt=``ideque``...`procedureDetermines ideque equality, given an element-equality procedure. Ideque A equals ideque B if they are of the same length, and their corresponding elements are equal, as determined by

*elt=*. If the element-comparison procedure's first argument is from*idequei*, then its second argument is from*idequei+1*, i.e. it is always called as`(elt= a b)`for*a*an element of ideque A, and*b*an element of ideque B.In the n-ary case, every

*idequei*is compared to*idequei+1*(as opposed, for example, to comparing*ideque1*to every*idequei*, for i > 1). If there are zero or one ideque arguments,`ideque=`simply returns true. The name does not end in a question mark for compatibility with the SRFI-1 procedure`list=`.Note that the dynamic order in which the

*elt=*procedure is applied to pairs of elements is not specified. For example, if`ideque=`is applied to three ideques, A, B, and C, it may first completely compare A to B, then compare B to C, or it may compare the first elements of A and B, then the first elements of B and C, then the second elements of A and B, and so forth.The equality procedure must be consistent with

`eq?`. Note that this implies that two ideques which are`eq?`are always`ideque=`, as well; implementations may exploit this fact to "short-cut" the element-by-element comparisons.