Problem using `execute` and boolean parameters

First of all, great job with this module! It was a really smooth transition from the mysql module.

Now to the problem...

I have a table with a isAddon TINYINT(1) NOT NULL column.

Such a column is converted to a boolean when selecting from the table, but when using a boolean parameter to filter the table only works with the query() method and not execute(). I get the same result no matter if I pass true or false as a parameter, see example below.

This does not work:

// running a query where I want: isAddon=0
db.execute('select count(*) from MyTable where isAddon = ?', [false]).then(console.log)
Promise { <pending> }
> [ [ BinaryRow { 'count(*)': 680 } ],
  [ { catalog: 'def',
      schema: '',
      name: 'count(*)',
      orgName: '',
      table: '',
      orgTable: '',
      characterSet: 63,
      columnLength: 21,
      columnType: 8,
      flags: 129,
      decimals: 0 } ] ]

// running a query where I want: isAddon=1
> db.execute('select count(*) from MyTable where isAddon = ?', [true]).then(console.log)
Promise { <pending> }
> [ [ BinaryRow { 'count(*)': 680 } ],
  [ { catalog: 'def',
      schema: '',
      name: 'count(*)',
      orgName: '',
      table: '',
      orgTable: '',
      characterSet: 63,
      columnLength: 21,
      columnType: 8,
      flags: 129,
      decimals: 0 } ] ]

As you can see the results are the same, I get 680 number of rows for both queries.

Using query() works:

// running the query where I want: isAddon=0
> db.query('select count(*) from MyTable where isAddon = ?', [false]).then(console.log)
Promise { <pending> }
> [ [ TextRow { 'count(*)': 680 } ],
  [ { catalog: 'def',
      schema: '',
      name: 'count(*)',
      orgName: '',
      table: '',
      orgTable: '',
      characterSet: 63,
      columnLength: 21,
      columnType: 8,
      flags: 129,
      decimals: 0 } ] ]

// running the query where I want: isAddon=1
> db.query('select count(*) from MyTable where isAddon = ?', [true]).then(console.log)
Promise { <pending> }
> [ [ TextRow { 'count(*)': 7 } ],
  [ { catalog: 'def',
      schema: '',
      name: 'count(*)',
      orgName: '',
      table: '',
      orgTable: '',
      characterSet: 63,
      columnLength: 21,
      columnType: 8,
      flags: 129,
      decimals: 0 } ] ]

As you can see I get different results, which are correct, 680 number of rows where isAddon=0 and 7 rows where isAddon=1.

Converting boolean's to number's also work with execute():

> db.execute('select count(*) from MyTable where isAddon = ?', [Number(false)]).then(console.log)
Promise { <pending> }
> [ [ BinaryRow { 'count(*)': 680 } ],
  [ { catalog: 'def',
      schema: '',
      name: 'count(*)',
      orgName: '',
      table: '',
      orgTable: '',
      characterSet: 63,
      columnLength: 21,
      columnType: 8,
      flags: 129,
      decimals: 0 } ] ]

> db.execute('select count(*) from MyTable where isAddon = ?', [Number(true)]).then(console.log)
Promise { <pending> }
> [ [ BinaryRow { 'count(*)': 7 } ],
  [ { catalog: 'def',
      schema: '',
      name: 'count(*)',
      orgName: '',
      table: '',
      orgTable: '',
      characterSet: 63,
      columnLength: 21,
      columnType: 8,
      flags: 129,
      decimals: 0 } ] ]

NodeJS version: v6.7.0
mysql2 version: 1.1.1

Reproduce the difference between the execute() and query() entry points with boolean and numeric parameters against a TINYINT(1) column. Trace parameter handling for execute(), then add coverage that distinguishes true from false and confirms the existing numeric behavior.