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* switch from float64 -> float32; other browsers use 32-bit floats too
* specify integer size as 32-bit
* use NetworkBitmap for background-image value (currently just an
invalid dummy value)
* remove "none" property & value types
CSSValue's payload is always one word (plus another for the type tag).
CSSValues keeps its size, but no longer has to heap-alloc + refcount
word-sized CSSValues.
(On 32-bit systems, CSSValues might actually be larger than before,
but I expect it's still a net benefit with the removal of refcounting
and the switch to 32-bit floats.)
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I'm not a fan, because it hides bugs. But working around the overflow
errors is starting to get unwieldy.
On 32-bit systems, we try to use compiler intrinsics as Nim does.
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using div instead of / is sort of weird, but it makes it clearer if
we're dividing floats or layoutunits (and is already what the code
uses).
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as much as I wish it weren't, layout *is* css.
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