Why do some pipeline parameters show as Required (even if they're not)

Hi, I sometimes use a pattern where default values are defined in a Variable Library, and when doing an interactive pipeline run I can override the defaults by explicitly entering parameter values - otherwise, just leave the parameter input boxes blank to use the defaults (variable library). This is achieved by using @coalesce(parameter, variable library) in the pipeline activities. If the parameter is blank, the activity will use the variable library. However, for any datatype except String type, the parameter input boxes show as Required in the run pipeline UI when triggering a manual run. A