CLI wrongly interprets non-existing options

[Godin]

Execution of

java -jar jacoco-0.8.10/lib/jacococli.jar report --excludes

leads to

"--excludes" is not a valid option

as expected.

However execution of

java -jar jacoco-0.8.10/lib/jacococli.jar report --classfiles Example.class --html report --sourcefiles . --excludes=bar

unexpectedly leads to

Exception in thread "main" java.io.UnsupportedEncodingException: bar

i.e. --excludes=bar is interpreted as --encoding bar.

Execution of

java -jar jacoco-0.8.10/lib/jacococli.jar report --classfiles Example.class --html report --foo=bar

unexpectedly leads to creation of a file bar containing XML report, i.e. --foo=bar is interpreted as --xml.

Seems that this happens due to the following code in args4j
https://github.com/kohsuke/args4j/blob/args4j-site-2.0.28/args4j/src/org/kohsuke/args4j/CmdLineParser.java#L586-L599
https://github.com/kohsuke/args4j/blob/args4j-site-2.0.28/args4j/src/org/kohsuke/args4j/CmdLineParser.java#L481-L483