Improve map gen construction and usage performance

[bsless]

Round 2 :) See detailed commit message Benchmark results:

(require '[malli.generator :as mg])

(dotimes [_ 10]
  (time
   (dotimes [_ 1e5]
     (mg/generator [:map [:a :int] [:b :int]]))))

"Elapsed time: 377.558951 msecs" ;; before
"Elapsed time: 359.188257 msecs" ;; after

(def g (mg/generator [:map [:a :int] [:b :int]]))

(dotimes [_ 10]
  (time
   (dotimes [_ 1e5]
     (mg/generate g))))

"Elapsed time: 511.243682 msecs" ;; before
"Elapsed time: 370.793034 msecs" ;; after

[ikitommi]

code looks much cleaner, thanks!

[bsless]

Cheers I still wonder if generation could be faster Three options:

• tuple of entries into map
• fmap zipmap ks to tuple gen
• tower of gen/bind assoc to transient map

But I'm pretty happy with how much I've been able to trim this down, too

[bsless]

For the record, this brings the malli example to (only?) 2x slower than the pure gen composition https://github.com/bsless/fsm-test-check/blob/master/examples/add_delete_tx_malli.clj