Guess the language by the error

Vlad found a good bug in SICP-JS: https://juan-gandhi.dreamwidth.org/4681686.html?thread=126995414#cmt126995414.

So, I went ahead and implemented both merge and mul_merge versions in JS. My versions looked drastically different:

$ time node a.js // using merge, take 40
real	0m4.581s
user	0m4.332s
sys	0m0.386s

$ time node b.js // using mul_merge, take 40
real	0m0.261s
user	0m0.245s
sys	0m0.034s

I thought maybe my implementation of streams is dumb. ( what the heck? )