setStencilPattern release

Something seems to be double-releasing in setStencilPattern: all my code is Lua so I don't think I should be able to cause this bug.

main.lua:421: lua_release called on object with retainCount == 0
stack traceback:
	[C]: in field 'setStencilPattern'
	main.lua:421: in function 'playdate_update'
	main.lua:436: in function <main.lua:433>

The offending line is just gfx.setStencilPattern(0.5); wrapping it (and the gfx.drawLine it refers to) in a push/pop context pair makes the problem go away.

I'm sorry that I don't have a lot of time to create a genuine minimal example, but I was hoping this might either be a known problem or something obvious once you look at the API code.

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