Differentiate "." from "./" in module resolution

[ghost]

In my sample node.js project:

a.js:

module.exports = "a.js";

a/index.js:

module.exports = "a/index.js"

We will load a different one of these modules depending on whether the imported module ends in a /.

For example:

a/test.js:

console.log([require("."), require("./")]);

Prints: [ 'a.js', 'a/index.js' ]

Also, if we have:

a/b/test2.js:

console.log([require(".."), require("../")]);

We get: [ 'a.js', 'a/index.js' ]

TypeScript's node.js module resolution should reflect this behavior, but currently does not.
See tests\cases\compiler\relativeModuleWithoutSlash.ts.