Nulls in array not permitted when array of optional booleans is defined

[cormip]

For example:

attendance:{
   type: Array,
   optional:true
},
"attendance.$" : {
   type: Boolean,
   optional:true
}

If I then try to save the array [true,null,false] I get an error "Must be of type Boolean". Is there another way to do this?

[aldeed]

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