This class models a collection of Quic transport parameters. This class is mutable and not thread safe. A parameter is considered absent if getParameter(TransportParameterId) yields null. The parameter is present otherwise. Parameters can be removed by calling setParameter(id, null). The methods getBooleanParameter(TransportParameterId) and getIntParameter(TransportParameterId) allow easy access to parameters whose type is boolean or int, respectively. When such a parameter is absent, its default value is returned by those methods. From RFC 9000, section 18.2:

Many transport parameters listed here have integer values.
Those transport parameters that are identified as integers use a
variable-length integer encoding; see Section 16. Transport parameters
have a default value of 0 if the transport parameter is absent, unless
otherwise stated.

[...]

If present, transport parameters that set initial per-stream flow control limits
(initial_max_stream_data_bidi_local, initial_max_stream_data_bidi_remote, and
initial_max_stream_data_uni) are equivalent to sending a MAX_STREAM_DATA frame
(Section 19.10) on every stream of the corresponding type immediately after opening.
If the transport parameter is absent, streams of that type start with a flow control
limit of 0.

A client MUST NOT include any server-only transport parameter:
       original_destination_connection_id,
       preferred_address,
       retry_source_connection_id, or
       stateless_reset_token.

A server MUST treat receipt of any of these transport parameters as a connection error
of type TRANSPORT_PARAMETER_ERROR.