Nested environment variables are being lowercased (regression?)

[tzellman]

In v15.4.1, when passing in nested environment variables, the case of the nested fields would remain how they were defined.

e.g.

const argv = yargs.env('CONFIG')....

and defining an environment variable like CONFIG_some__nested__camelCase__id=foo.

In v15.4.1 this would parse as {some: {nested: {camelCase: {id: 'foo'}}}}

In the latest 16.2 release, I am seeing: {some: {nested: {camelcase: {id: 'foo'}}}}

Note the camelCase field is now lowercased.

I can provide a repro example, but wanted to get the issue out here, in case this was already known (either as a regression or as new behavior). Thanks!

[bcoe]

@tzellman could you provide a failing test case in this repository? there have been a few bug fixes around camel case expansion.