vendorNativeType
If you use GET /objects/{objectName}/metadata to returns the metadata for an object, you will see vendorNativeType properties. In some cases, the API name of a field is appended with a " - ". You can find the enumerated values with the GET /{objectName} endpoint.
For example, to find enumerated values of this field in the LeanLeadCollection resource, call GET /LeanLeadConsistencyStatusCodeCollection.
{
"vendorReadOnly": true,
"updateable": "false",
"filterable": "true",
"createable": "false",
"vendorNativeType": "Edm.String - LeanLeadConsistencyStatusCodeCollection",
"type": "string",
"vendorPath": "ConsistencyStatusCode"
}