Failing to filter source appropriately in a nix build.

srcDir.nix

let
  inherit (builtins) any filterSource;
  nixpkgs = import ./nixpkgs.nix;
  inherit (nixpkgs.lib.debug) traceSeq traceVal;
  # Parent of util is nix.
  # Parent of nix is srcDir:
  rawSrcDir = ../../..;

  _skipPaths = map (n: rawSrcDir + "/${n}") [
    ".git"
    "nix"
  ];

  skipPaths = traceSeq "${builtins.toJSON _skipPaths}" _skipPaths;
  selectPath = path: kind:
    let
      isSkipPath = skipPath:
        traceSeq "Comparing path ${path} to skipPath ${skipPath}" (
          path == skipPath
        );
    in
      !(any isSkipPath skipPaths);

in
  filterSource selectPath rawSrcDir