Buffer property return TEXT instead of buffer

Bug or feature request

• Bug
• Feature request

Description of feature (or steps to reproduce if bug)

Currently, I am using this with loopback4. But the connector does not provide some type support such as, Buffer or Array. They will all turn into TXET in sqlite3. And more importantly, the 'Buffer' seems to work quite well. When i wrote something to a 'Buffer' property, it will ture in to some TEXT like

{ type: 'Buffer',
  data: 
   [ 120,
     156,
     237,
     205,
     59,
]
```.
And I when i retrieve it is still a JSON object instead of a Buffer object which is different than the TypeScript definition in my model property. While Typescript believe it is a buffer,,,,


### Link to sample repo to reproduce issue (if bug)



### Expected result



### Actual result (if bug)



### Additional information (Node.js version, LoopBack version, etc)

El issue menciona loopback-connector-sqlite3 y SQLite3, pero no indica archivos, pruebas ni un repositorio de reproducción. Empieza localizando las rutas de conversión de tipos y recuperación del conector y, después, reproduce el comportamiento de la propiedad Buffer; el trabajo debería considerarse terminado cuando los valores Buffer almacenados se recuperen como objetos Buffer en lugar de valores TEXT con forma de JSON.