By default, we currently allow a user to retrieve all responses from a
thread, which is terrible from a performance standpoint.
This change adds a default response size of 100, which was chosen to
match typical production pagination parameters, and a response limit of
200. Given that responses can include children comments, 200 is still a
large number, but far less disastrous than, say, getting 3000 responses,
with all of their children comments.
Both of these values are configurable, and can be overriden via
environment variables.
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