`seekType` function

[nichoth]

The readme includes this example

query(
  fromDB(db),
  where(equal(seekType, 'post', { indexType: 'type' })),
  toCallback((err, msgs) => {
    console.log('There are ' + msgs.length + ' messages of type "post"')
  })
)

// The `seekType` function takes a buffer and uses `bipf` APIs to search for
// the fields we want.
const bValue = Buffer.from('value') // better for performance if defined outside
const bContent = Buffer.from('content')
const bType = Buffer.from('type')
function seekType(buffer) {
  var p = 0 // p stands for "position" in the buffer, offset from start
  p = bipf.seekKey(buffer, p, bValue)
  if (p < 0) return
  p = bipf.seekKey(buffer, p, bContent)
  if (p < 0) return
  return bipf.seekKey(buffer, p, bType)
}

Including some higher level text would help me understand this I think. What is the seekType function doing here? It could be good to include an example using 'real' fields in messages, instead of 'value', 'content', and 'type' like above

thanks