class Restforce::Collection

def size

endpoint (and maybe others?!) uses the `size` attribute.
some reason, the [List View Results](https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/resources_listviewresults.htm)
Most of the Salesforce API returns this in the `totalSize` attribute. For

we can rely on the total count of results which Salesforce returns.
requests and going through all of the pages of results, one by one. Instead,
Return the number of items in the Collection without making any additional 
def size
  @raw_page['totalSize'] || @raw_page['size']
end