AST perf on ~58MB tree

	A	B	C	D	E	F
1	AST clone method	Encode time	postMessage time	Decode time	Time on UI thread	total time
2	Stringify	1202	167	1572	1572	2941
3	Stringify	1127	181	1540	1540	2848
4	Stringify	962	170	1536	1536	2668
5	Stringify + ArrayBuffer xfer	2733	63	4243	4243	7039
6	Stringify + ArrayBuffer xfer	2720	54	4135	4135	6909
7	Structured clone	0	15749	0	15749	15749
8	Structured clone	0	16046	0	16046	16046
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