Add true streaming #93

Job	Run time
windows (lua53, lua5.3, 5.3, /mingw64/include/lua5.3/)	2m 51s
unix (5.1, ubuntu-latest)	1m 18s
windows (lua, lua, 5.4, /mingw64/include/)	2m 49s
unix (5.1, macos-latest)	1m 57s
windows (luajit, luajit, 5.1, /mingw64/include/luajit-2.1/)	2m 48s
unix (5.2, ubuntu-latest)	1m 9s
unix (5.2, macos-latest)	1m 51s
unix (5.3, ubuntu-latest)	55s
unix (5.3, macos-latest)	1m 56s
unix (5.4.7, ubuntu-latest)	1m 5s
unix (5.4.7, macos-latest)	2m 0s
unix (luajit-openresty, ubuntu-latest)	50s
unix (luajit-openresty, macos-latest)	2m 0s
	23m 29s

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