SQLite

      input arguments, possibly modified. See below.
    }
  }
  ```

  The arguments are in the same form accepted by oo1.DB.exec(), with
  the exceptions noted below.

  If the `countChanges` arguments property (added in version 3.43) is
  truthy then the `result` property contained by the returned object
  will have a `changeCount` property which holds the number of changes
  made by the provided SQL. Because the SQL may contain an arbitrary
  number of statements, the `changeCount` is calculated by calling
  `sqlite3_total_changes()` before and after the SQL is evaluated. If
  the value of `countChanges` is 64 then the `changeCount` property
  will be returned as a 64-bit integer in the form of a BigInt (noting
  that that will trigger an exception if used in a BigInt-incapable
  build).  In the latter case, the number of changes is calculated by
  calling `sqlite3_total_changes64()` before and after the SQL is
  evaluated.

  A function-type args.callback property cannot cross
  the window/Worker boundary, so is not useful here. If
  args.callback is a string then it is assumed to be a
  message type key, in which case a callback function will be
  applied which posts each row result via:

            columnNames: rc.columnNames,
            rowNumber: ++rowNumber,
            row: row
          }, wState.xfer);
        }
      }
      try {
        const changeCount = !!rc.countChanges
              ? db.changes(true,(64===rc.countChanges))
              : undefined;
        db.exec(rc);
        if(undefined !== changeCount){
          rc.changeCount = db.changes(true,64===rc.countChanges) - changeCount;
        }
        if(rc.callback instanceof Function){
          rc.callback = theCallback;
          /* Post a sentinel message to tell the client that the end
             of the result set has been reached (possibly with zero
             rows). */
          wState.post({
            type: theCallback,

    catch(e){msgHandler.reject(e)}
  }/*worker.onmessage()*/;
  return function(/*(msgType, msgArgs) || (msgEnvelope)*/){
    let msg;
    if(1===arguments.length){
      msg = arguments[0];
    }else if(2===arguments.length){
      msg = Object.create(null);
      msg.type = arguments[0];
      msg.args = arguments[1];

    }else{
      toss("Invalid arugments for sqlite3Worker1Promiser()-created factory.");
    }
    if(!msg.dbId) msg.dbId = dbId;
    msg.messageId = genMsgId(msg);
    msg.departureTime = performance.now();
    const proxy = Object.create(null);

  delete self.sqlite3Worker1Promiser;

  const wtest = async function(msgType, msgArgs, callback){
    if(2===arguments.length && 'function'===typeof msgArgs){
      callback = msgArgs;
      msgArgs = undefined;
    }
    const p = 1
          ? workerPromise({type: msgType, args:msgArgs})
          : workerPromise(msgType, msgArgs);
    return callback ? p.then(callback).finally(testCount) : p;
  };

  let sqConfig;
  const runTests = async function(){
    const dbFilename = '/testing2.sqlite3';
    startTime = performance.now();


    await wtest('config-get', (ev)=>{
      const r = ev.result;
      log('sqlite3.config subset:', r);
      T.assert('boolean' === typeof r.bigIntEnabled);
      sqConfig = r;
    });
    logHtml('',

  const runTests2 = async function(){
    const mustNotReach = ()=>toss("This is not supposed to be reached.");

    await wtest('exec',{
      sql: ["create table t(a,b)",
            "insert into t(a,b) values(1,2),(3,4),(5,6)"
           ].join(';'),
      resultRows: [], columnNames: [],
      countChanges: sqConfig.bigIntEnabled ? 64 : true
    }, function(ev){
      ev = ev.result;
      T.assert(0===ev.resultRows.length)
        .assert(0===ev.columnNames.length)
        .assert(sqConfig.bigIntEnabled
                ? (3n===ev.changeCount)
                : (3===ev.changeCount));
    });

    await wtest('exec',{
      sql: 'select a a, b b from t order by a',
      resultRows: [], columnNames: [],
    }, function(ev){
      ev = ev.result;
      T.assert(3===ev.resultRows.length)
        .assert(1===ev.resultRows[0][0])
        .assert(6===ev.resultRows[2][1])
        .assert(2===ev.columnNames.length)
        .assert('b'===ev.columnNames[1]);
    });

    await wtest('exec',{
      sql: 'select a a, b b from t order by a',
      resultRows: [], columnNames: [],
      rowMode: 'object',
      countChanges: true
    }, function(ev){
      ev = ev.result;
      T.assert(3===ev.resultRows.length)
        .assert(1===ev.resultRows[0].a)
        .assert(6===ev.resultRows[2].b)
        .assert(0===ev.changeCount);
    });

    await wtest(
      'exec',
      {sql:'intentional_error'},
      mustNotReach
    ).catch((e)=>{
      warn("Intentional error:",e);
    });

    await wtest('exec',{
      sql:'select 1 union all select 3',
      resultRows: []
    }, function(ev){
      ev = ev.result;
      T.assert(2 === ev.resultRows.length)
        .assert(1 === ev.resultRows[0][0])
        .assert(3 === ev.resultRows[1][0])
        .assert(undefined === ev.changeCount);
    });

    const resultRowTest1 = function f(ev){
      if(undefined === f.counter) f.counter = 0;
      if(null === ev.rowNumber){
        /* End of result set. */
        T.assert(undefined === ev.row)