In `swapTokensForTokens` and `priceImpact`, shouldn't the `amountIn` be added to `token0Reserve`? eg in `swapTokensForTokens`, I think the first `if` should include a `this.token0Reserve += amountIn`, and similarly in the second `if` the amountIn should be added to token1Reserve and in `priceImpact` I think the `priceAfter` in the first `if` should be ``` priceAfter = this.quote( 1, this.token0Reserve + amountIn, this.token1Reserve - delta ); ``` and in the second if ``` priceAfter = this.quote( 1, this.token0Reserve - delta, this.token1Reserve + amountIn ); ``` Am I missing something?

This isn't actually used anywhere, but was a playground for seeing if we wanted to simulate the AMMs too; so not really surprised it needs a little TLC. I think you're right, it should definitely add the amountIn.