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The help page says a wrap object's Offset may be positive or negative (https://help.adobe.com/archive/en_US/illustrator/cs4/illustrator_cs4_help.pdf#page=307). Text Wrap Options, the commands, the MCP tool and .ai import already kept a negative value, but layout set it to 0. - Layout keeps the signed offset, within -1000 to 1000 pt like the commands and .ai import (a value that is not a number counts as 0). - Around a wrap object, a negative offset shrinks the object by that distance from each edge, holes included, so lines beside, above and below it run that far into it. A shape narrower than twice the distance no longer moves text aside. A line may get less room than the exact shrunk shape leaves, for example where several edges come close to one piece of the band, or where a band holds more than 64 anchor heights. It never gets less room than an offset of 0 leaves. - With Invert Wrap, a negative offset keeps the text that far inside the object. - Zero and positive offsets up to 1000 pt lay out as before. A larger positive offset lays out as 1000 pt. - The params text of object.textWrap.make and object.textWrap.options and the MCP text_wrap offset description give the range and what a negative value does. Docs: docs/target-app-parity.md.