wagon-ssh-external does not always detect usage of PSCP (as opposed to SSH)

The plugin does not detect that PSCP is being used if the executable's name is all uppercase (as below). It throws a very-unhelpful 'unknown option "-o"' error.

<configuration>
<sshExecutable>c:/Program Files/Putty Suite/PLINK.EXE</sshExecutable>
<scpExecutable>c:/Program Files/Putty Suite/PSCP.EXE</scpExecutable>
<sshArgs>-v</sshArgs>
</configuration>

This one stumped me for a while.