According to https://mgree.github.io/ffs/ffs.1.html https://mgree.github.io/ffs/ffs.1.html, it tries to autodetect the type (so false will default to a boolean)

According to https://mgree.github.io/ffs/ffs.1.html https://mgree.github.io/ffs/ffs.1.html, it tries to autodetect the type (so false will default to a boolean) but you can explicitly specify the type via extended attributes.