the id field of memberships seems to be bogus

[mhl]

... and not in the Bill and Ted sense. For example, in the membership here:

• http://yournextmp.popit.mysociety.org/api/v0.1/memberships/54c670522df1cc775b2402df

The id in the id field (which 404s) is different from the one in the url and html_url fields, which work.

[mhl]

This also means that if you GET a membership and then PUT it back again, you get the error:

{
  "errors": [
    "URL id and document id are different"
  ]
}