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Fixes the default stroke option declared by the hexbin transform. Instead of declaring a default stroke (which was wrong in the case of the tip mark—it’s the only mark with both a default fill and a default stroke), it now declares an initially-empty fill channel. This allows the mark constructor to know that a fill channel will be populated by the initializer, and hence chose the correct default stroke.
Before:
![Screenshot 2023-05-26 at 8 37 34 AM](https://private-user-images.githubusercontent.com/230541/241262993-3f0218d6-dfb6-4eea-890a-d4865cd084dd.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3Mzk1MTgyOTgsIm5iZiI6MTczOTUxNzk5OCwicGF0aCI6Ii8yMzA1NDEvMjQxMjYyOTkzLTNmMDIxOGQ2LWRmYjYtNGVlYS04OTBhLWQ0ODY1Y2QwODRkZC5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMjE0JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDIxNFQwNzI2MzhaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT00ODc0MDViZWRiNGIwY2JmZjQ3Njg0MThjMzIzYmQ0ZmU2YTc5ZWVmZTIzYTU3NzA5NDVhZDQwZmJhNDhkZGRiJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.SRYswZzv545bMJvNR4WfkI96fBKno0sCK65Oa5HYysc)
After:
![Screenshot 2023-05-26 at 8 36 45 AM](https://private-user-images.githubusercontent.com/230541/241262821-d4713fa9-92ae-4b34-b828-ae2600d3c6f4.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3Mzk1MTgyOTgsIm5iZiI6MTczOTUxNzk5OCwicGF0aCI6Ii8yMzA1NDEvMjQxMjYyODIxLWQ0NzEzZmE5LTkyYWUtNGIzNC1iODI4LWFlMjYwMGQzYzZmNC5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMjE0JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDIxNFQwNzI2MzhaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT0yNTA3NzY4MzA5MmI3N2QwYjI5YzYwYjEzYmI4OTZiOGU1NWU5NTkzZTM0M2E2MjYyNDAwMDlhMmQzNTBhYWQ5JlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.CQy8AqEeXcg2zknBQGClLh4fZYVNr7tWjgndUwdrWUQ)