public Boolean getBooleanClaim(String name) throws JwtInvalidException {
    return this.rawJwt.getBooleanClaim(name);
  }
Returns the non-registered claim of name {@code name} and type Boolean. Throws a
JwtInvalidException if no such claim is present or the claim has another type.
java_src/src/main/java/com/google/crypto/tink/jwt/VerifiedJwt.java