Right now you have to use "package.d", you can't use "Package.d" as an example. It feels out of place when all my folders and other D files are capitalized. I would like to use "Package.d" to match all my other files. The "package" name can still be unique, in that only one instance of "package.d" is allowed, regardless of letter-case. So having two files named "Package.d" and "package.d" in the same module package would be an error.
@dkorpel created dlang/dmd pull request #14260 "Fix 16701 - Remove Restriction of "package.d" Source File Module Forc…" fixing this issue: - Fix 16701 - Remove Restriction of "package.d" Source File Module Forced to All Lowercase https://github.com/dlang/dmd/pull/14260
dlang/dmd pull request #14260 "Fix 16701 - Remove Restriction of "package.d" Source File Module Forc…" was merged into master: - 5866d05b7b8cd754df3e5e5fc031879e6637abe9 by Dennis Korpel: Fix 16701 - Remove Restriction of "package.d" Source File Module Forced to All Lowercase https://github.com/dlang/dmd/pull/14260