It's important that this be kept secret. Options take string, numeric, or boolean values. Keywords can be abbreviated to unique prefixes. Keywords are not case-sensitive. The user may also override this setting by specifying a user ID on the PGP command line with the -u option.
Canonical text has a carriage return and a linefeed at the end of each line of text.
This mode is automatically turned off if PGP detects that the plaintext file contains 8-bit binary data. Thus, it is safe to leave enabled at all times. If you tend to use PGP mostly for E-mail, it may be a good idea to enable this parameter. This prevents munging by mailers, but requires PGP to simply read the message. PGP will remove the quoting if you use it to decrypt the message, but the trailing whitespace is not recovered.