How to handle bytea

[floratmin]

Hello,

I try to understand how i can handle bytea in plv8. I want to create the same object internally as used by plv8:

create or replace test_buffer(n int) returns bytea as
$$
    const obj = {"0":60,"1":78,"2":85,"3":76,"4":76,"5":62};
    const res = plv8.execute(`select decode as "bytea" from decode(encode('<NULL>', 'hex'), 'hex')`);
    const byte = res[0].bytea;
    plv8.elog(NOTICE, 'Created object:');
    plv8.elog(NOTICE, JSON.stringify(Object.entries(obj)));
    plv8.elog(NOTICE, JSON.stringify(obj));
    plv8.elog(NOTICE, Object.getPrototypeOf(obj));
    plv8.elog(NOTICE, '"bytea" from query:');
    plv8.elog(NOTICE, JSON.stringify(Object.entries(byte)));
    plv8.elog(NOTICE, JSON.stringify(byte));
    const e = Object.getPrototypeOf(byte);
    plv8.elog(NOTICE, 'still running');
    try {
      plv8.elog(NOTICE, Object.getPrototypeOf(byte));
      plv8.elog(NOTICE, 'not running here');
    try {
    } catch(err) {
      plv8.elog(NOTICE, err);
    }
    if (n  === 0) {
      return '<NULL>'; 
    }
    if (n === 1) {
      return byte;
    }
   if (n === 2) {
     return obj;
   }
$$ language plv8;

When i get the bytea returned by postgres and try to log the Object.getPrototypeOf(byte) i get an error: 'TypeError: this is not a typed array.' When i try to construct an object with the same structure and entries and return it the result is totally different from the expected result. Executing test_buffer with n = 0 and n = 1 i get the desired result of \x3c4e554c4c3e, but with n = 2 i get \x060000200100008001000000010000000100000001000000010000000a000010080000100800001008000010080000100800001030313233343500002000000000803c002000000000804e0020000000008055002000000000804c002000000000804c002000000000803e00.

I tried also the functions suggested in https://github.com/plv8/plv8/issues/189 where i get from select create_array(5); create_array
\x0500004006000090080000100800001008000010080000101800000000800000180000000080000018000000008000001800000000800000180000000080 and from select get_array_length(create_array(5)); get_array_length 62 This is also related to my other question about typed arrays i posted on stackoverflow:

https://stackoverflow.com/questions/59466409/plv8-manipulating-typed-arrays-not-possible

Thank you