Add true streaming #94

Job	Run time
windows (lua53, lua5.3, 5.3, /mingw64/include/lua5.3/)	3m 14s
unix (5.1, ubuntu-latest)	59s
windows (lua, lua, 5.4, /mingw64/include/)	3m 6s
unix (5.1, macos-latest)	2m 16s
windows (luajit, luajit, 5.1, /mingw64/include/luajit-2.1/)	3m 17s
unix (5.2, ubuntu-latest)	1m 10s
unix (5.2, macos-latest)	2m 17s
unix (5.3, ubuntu-latest)	1m 5s
unix (5.3, macos-latest)	2m 24s
unix (5.4.7, ubuntu-latest)	59s
unix (5.4.7, macos-latest)	2m 12s
unix (luajit-openresty, ubuntu-latest)	1m 44s
unix (luajit-openresty, macos-latest)	2m 20s
	27m 3s

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