[BUG] excessive memory usage

[thqby]

When I tested yaml to load a 1.6m json file, I found that the ahk_h v2 version will use up to 500+m of memory, while ahk_L v2 version only needs 20-30m of memory.
test code:

a := FileRead('js.json', 'utf-8')
o := Yaml(a)
MsgBox()