Twilio API Paging Bug

test.rb

require 'json'
require 'rest_client'

ACCOUNT_SID = "XXX"
AUTH_TOKEN  = "YYY"
API_BASE    = "https://#{ACCOUNT_SID}:#{AUTH_TOKEN}@api.twilio.com"
TEST_DATE   = "2012-10-27"

def fetch_call_sids_from_uri(uri, sids=[])
  # fetch and parse data
  json = RestClient.get "#{API_BASE}#{uri}"
  data = JSON.parse json
  # put returned sids in sids array
  data['calls'].each { |call| sids.push(call['sid']) }
  # recursively repeat if next_page_uri exists; return sids
  next_page_uri = data['next_page_uri']
  next_page_uri ? fetch_call_sids_from_uri(next_page_uri, sids) : sids
end

non_paged_sids = fetch_call_sids_from_uri "/2010-04-01/Accounts/#{ACCOUNT_SID}/Calls.json?StartTime=#{TEST_DATE}&PageSize=1000"
paged_sids     = fetch_call_sids_from_uri "/2010-04-01/Accounts/#{ACCOUNT_SID}/Calls.json?StartTime=#{TEST_DATE}&PageSize=50"

puts "Test Date: "        << TEST_DATE
puts "# when not paged: " << non_paged_sids.length.to_s
puts "# when paged: "     << paged_sids.length.to_s
puts "missing sids:\n"    << (non_paged_sids - paged_sids).to_s

# SAMPLE OUTPUT
# Test Date: 2012-10-27
# # when not paged: 258
# # when paged: 252
# missing sids:
# ["CAxxx", "CAxxx", "CAxxx", "CAxxx", "CAxxx", "CAxxx", "CAxxx", "CAxxx", "CAxxx"]