View difference between Paste ID: ufhuPU6L and tda71HS8

 $ curl localhost:5984
 {"couchdb":"Welcome","uuid":"9e5ef59f41dc168d7976fda38a1b7198","version":"1.5.0","vendor":{"version":"1.5.0-1","name":"Homebrew"}}
 
 $ curl -X PUT http://localhost:5984/testdb
 {"ok":true}
 
 $ curl -X POST http://localhost:5984/testdb/_bulk_docs -H 'content-type:application/json' -d '{"docs":[{"_id":"1","key":"a"},{"_id":"2","key":"b"},{"_id":"3","key":"b"},{"_id":"4","key":"b"},{"_id":"5","key":"c"},{"_id":"6","key":"d"},{"_id":"7","key":"d"}]}'
 [{"ok":true,"id":"1","rev":"1-f443804e079279645227a179f7e373cf"},{"ok":true,"id":"2","rev":"1-d35680189514ccd6046f23daa89b0f84"},{"ok":true,"id":"3","rev":"1-d35680189514ccd6046f23daa89b0f84"},{"ok":true,"id":"4","rev":"1-d35680189514ccd6046f23daa89b0f84"},{"ok":true,"id":"5","rev":"1-081b779480759004290d1aeb5d8fa35b"},{"ok":true,"id":"6","rev":"1-ad4fdc41af538992ae8075ed3c5d5cbd"},{"ok":true,"id":"7","rev":"1-ad4fdc41af538992ae8075ed3c5d5cbd"}]
 
 $ curl -X PUT http://localhost:5984/testdb/_design/view -H 'content-type:application/json' -d '{"views" : {"view": {"map":"function (doc){emit(doc.key);}"}}}'
 {"ok":true,"id":"_design/view","rev":"1-849accd6d0a515c9f772806b6ecc1d25"}
 
 # expected 2, returns 0
 # curl 'http://localhost:5984/testdb/_design/view/_view/view?startkey="b"&startkey_docid="2"&endkey="b"&endkey_docid="3"'
 {"total_rows":7,"offset":1,"rows":[
 
 ]}
 
 # descending works the same way
 $ curl 'http://localhost:5984/testdb/_design/view/_view/view?startkey="b"&startkey_docid="3"&endkey="b"&endkey_docid="2"&descending=true'
 {"total_rows":7,"offset":6,"rows":[
 
 ]}
 
 # full curl for clarity
 $ curl 'http://localhost:5984/testdb/_design/view/_view/view'
 {"total_rows":7,"offset":0,"rows":[
 {"id":"1","key":"a","value":null},
 {"id":"2","key":"b","value":null},
 {"id":"3","key":"b","value":null},
 {"id":"4","key":"b","value":null},
 {"id":"5","key":"c","value":null},
 {"id":"6","key":"d","value":null},
 {"id":"7","key":"d","value":null}
 ]}