https://codereview.chromium.org/23604020/diff/1/src/objects.layout
File src/objects.layout (right):

https://codereview.chromium.org/23604020/diff/1/src/objects.layout#newcode56
src/objects.layout:56: { name: "value", comment: "the boxed contents."
},
I guess a field without a type is just assumed to be tagged?

https://codereview.chromium.org/23604020/diff/1/src/objects.layout#newcode119
src/objects.layout:119: { name: "flag", type: tSmi, bitfield: [
Should we by default pack bools into a bitfield? And if we want a
particular boolean unpacked for fast access, then we could have an
"unpacked" attribute.

https://codereview.chromium.org/23604020/

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