[Bug] Custom formats not working for objects

[WaldoJeffers]

Hello,

It seems custom formats work well for "primitive" types (string, boolean...) but not for objects. The format validator never seems to be called. Is this intentional, or is it a bug?

/* Working ok */
"schema": {
  "type": "object",
  "format": "custom_object"
}   


/* Not working */
"schema": {
  "type": "object",
  "format": "custom_object"
} 

If this is indeed a bug, I'd be willing to work on submitting a PR, if I'm given a few guidelines :)

Thanks :)