System.IO.Ports.SerialPort defaults are undocumented

The documentation might mention defaults for various serial port parameters. For example, if handshake is unspecified as is true in various constructors, what value does it assume?
I found defaults in the source code starting here:
https://github.com/Microsoft/referencesource/blob/master/System/sys/system/IO/ports/SerialPort.cs#L43

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* ID: fa765d00-19f8-74e4-4be1-1d7f1e7dc6ce
* Version Independent ID: 260749e3-69c6-a370-89b0-4f90d944fac7
* Content: [SerialPort Class (System.IO.Ports)](https://docs.microsoft.com/en-us/dotnet/api/system.io.ports.serialport?view=netcore-2.0)
* Content Source: [xml/System.IO.Ports/SerialPort.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.IO.Ports/SerialPort.xml)
* Product: **.net**
* GitHub Login: @mairaw
* Microsoft Alias: **mairaw**