Repro steps:

1. Create a PBR shadergraph
2. Add a boolean keyword
3. Drag it onto graph
4. Toggle the keyword's default value
Expected result: the inline inputs remain vec1s
Actual result: they become bugged vec4s. The "off" slot will be reset to 0, 0, 0, 0 when the default is toggled on the property, and in the compiled shader, when a material is made of it, the inputs will act like vector1s, with only the X value considered.