[brew] brew install swagger-codegen installs incomplete version

I ran brew install swagger-codegen and this is the version it installed:

brew list swagger-codegen
/usr/local/Cellar/swagger-codegen/3.0.4/bin/swagger-codegen
/usr/local/Cellar/swagger-codegen/3.0.4/libexec/swagger-codegen-cli.jar

When I list supported langs, I see this:

swagger-codegen langs
10:13:06.568 [main] DEBUG io.swagger.codegen.v3.cli.SwaggerCodegen - there are not options for command 'langs'
10:13:06.570 [main] DEBUG io.swagger.codegen.v3.cli.SwaggerCodegen - there are not options for command 'version'
Available languages: [aspnetcore, csharp, csharp-dotnet2, dynamic-html, html, html2, java, 
jaxrs-cxf-client, jaxrs-cxf, inflector, jaxrs-cxf-cdi, jaxrs-spec, jaxrs-jersey, jaxrs-di, 
jaxrs-resteasy-eap, jaxrs-resteasy, spring, nodejs-server, openapi, openapi-yaml, 
kotlin-client, kotlin-server, php, scala, scala-akka-http-server, swift3, swift4, 
typescript-angular]

It is missing a bunch, like akka-scala.

When I download the jar, I see this:

wget http://central.maven.org/maven2/io/swagger/swagger-codegen-cli/2.3.1/swagger-codegen-cli-2.3.1.jar -O swagger-codegen-cli.jar
[snip]
java -jar swagger-codegen-cli.jar langs
Available languages: [ada, ada-server, akka-scala, android, apache2, apex, aspnetcore, 
bash, csharp, clojure, cwiki, cpprest, csharp-dotnet2, dart, elixir, elm, eiffel, 
erlang-client, erlang-server, finch, flash, python-flask, go, go-server, groovy, 
haskell-http-client, haskell, jmeter, jaxrs-cxf-client, jaxrs-cxf, java, inflector, jaxrs-cxf-cdi, 
jaxrs-spec, jaxrs, msf4j, java-pkmst, java-play-framework, jaxrs-resteasy-eap, 
jaxrs-resteasy, javascript, javascript-closure-angular, java-vertx, kotlin, lua, 
lumen, nancyfx, nodejs-server, objc, perl, php, powershell, pistache-server, 
python, qt5cpp, r, rails5, restbed, ruby, rust, rust-server, scala, scala-lagom-server, 
scalatra, scalaz, php-silex, sinatra, slim, spring, dynamic-html, html2, html, swagger, 
swagger-yaml, swift4, swift3, swift, php-symfony, tizen, typescript-aurelia, 
typescript-angular, typescript-angularjs, typescript-fetch, typescript-jquery, 
typescript-node, undertow, ze-ph]

So several issues:

• Version number reported by brew is 3.0.4 vs 2.3.1 for the jar.
• The brew version has far fewer languages
• The brew version also has odd DEBUG messages about no options for lang or version

Start by reproducing brew install swagger-codegen, brew list swagger-codegen, and swagger-codegen langs, then compare the installed 3.0.4 CLI with the downloaded 2.3.1 jar. Trace the Homebrew packaging entry point for swagger-codegen and verify that the installed version, supported languages, and command output match the intended distribution.