How about a command-line flag to name an input file, but also process input as JSON, so someone can pipe it to your command or hand-write it if they're crazy?

I'd use something like:

= becomes

== equals

=== is identical to

It's funny how everyone thinks "equals" in this context should be "identical to" when, in normal language, it doesn't really mean that at all!

It may have changed, but w3schools always used to be low-quality and to be avoided. Even today, from what I can tell, it's an inferior mirror of MDN (developer.mozilla.org)