Double star path matching not working as expected

[pjlast]

When trying to match something.java to the path **/something.java, the package returns false.

This seems to be incorrect. Every online glob match tester I've tried makes a successful match, for example:
https://www.digitalocean.com/community/tools/glob?comments=true&glob=**/something.java&matches=false&tests=something.java&tests=/something.java

But I could also be misunderstanding something here. Any clarification would be appreciated!

[jplewa]

FYI, https://github.com/bmatcuk/doublestar works as expected.

[sanmai-NL]

{**/something.java,something.java} works...