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I think GPs point is that they haven't gone from zero to a working solution, they've gone from zero to N% towards a working solution and then slowed down everyone else. Maybe for the most trivial programs they can actually reach a solution.

You can't write a program without knowing that x is a string or a number, your only choice is whether you document that or not.

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Yes you can, you handle every case equally. You don’t even need the reflection mechanisms to be visible to the user with a good type system. A good type system participates in codegen.

for a really simple example: languages which allow narrowing a numeric to a float, but also let you interpolate either into a string without knowing which you have.

A statically typed Console.log in JS/TS would be an unnecessary annoyance.

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