Discriminating between parse errors when using `Schema.union` with two struct schemas

const mySchema = S.union(
   S.struct({ _tag: 'A', value: S.string }),
   S.struct({ _tag: 'B', value: S.number }),
)
S.parse(mySchema)({ _tag: 'B', "not a number" })
/* 2 errors found
 ─ union member
   └─ ["_tag"]
      └─ Expected "A", actual "B"
└─ union member
   └─ ["value"]
      └─ Expected "number", actual "not a number"
*/

/* 1 error found
["value"]
└─ Expected "number", actual "not a number" for "B"
*/