[SMT] Implicit overflow when parsing !smt.bv type?

[maerhart]

When providing the following as input to circt-opt

hw.module @ImplicitOverflow() {
  %0 = smt.bv.constant #smt.bv<1> : !smt.bv<18446744073709551615>
}

it outputs

hw.module @ImplicitOverflow() {
  %c1_bv4294967295 = smt.bv.constant #smt.bv<1> : !smt.bv<4294967295>
  hw.output
}

Using !smt.bv<18446744073709551616> as input expectedly triggers an error that the integer is too large.
Seems like we store it in some 32 bit integer at some point?