Add true streaming #99

Job	Run time
windows (lua53, lua5.3, 5.3, /mingw64/include/lua5.3/)	3m 33s
unix (5.1, ubuntu-latest)	3m 24s
windows (lua, lua, 5.4, /mingw64/include/)	4m 2s
unix (5.1, macos-latest)	4m 9s
windows (luajit, luajit, 5.1, /mingw64/include/luajit-2.1/)	2m 53s
unix (5.2, ubuntu-latest)	3m 8s
unix (5.2, macos-latest)	3m 56s
unix (5.3, ubuntu-latest)	3m 11s
unix (5.3, macos-latest)	4m 17s
unix (5.4, ubuntu-latest)	4m 51s
unix (5.4, macos-latest)	4m 20s
unix (luajit-openresty, ubuntu-latest)	3m 35s
unix (luajit-openresty, macos-latest)	4m 14s
	49m 33s

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