Object.InternalSlot
type ('M, 'T) t = 'M * ('M, 'T) t'
and ('M, 'T) t' = {
id : ('M, 'M) Identifier.t;
value : ('M, 'T) Type.t;
optional : bool;
static : bool;
_method : bool;
comments : ('M, unit) Syntax.t option;
}