fix: 0 is falsey 🤦‍♂️

[0xApotheosis]

Description

Fixes a bug where hasNegativeRatio would be false if inputOutputRatio was 0.

Relates to a lib fix: shapeshift/lib#1230, however it's not a dependancy and this PR can go in without it.

Notice

• Have you followed the guidelines in our Contributing guide?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Pull Request Type

• 🐛 Bug fix (Non-breaking Change: Fixes an issue)
• 🛠️ Chore (Non-breaking Change: Doc updates, pkg upgrades, typos, etc..)
• 💅 New Feature (Breaking/Non-breaking Change)

Issue (if applicable)

N/A

Risk

Very small.

Testing

Couple with an incoming lib PR. TODO.

Engineering

Operations

Screenshots (if applicable)

N/A

[0xApotheosis]

Current dependencies on/for this PR:

• develop
  • PR fix: 0 is falsey 🤦‍♂️ #4177 👈
    • PR fix: minimum amounts #4178
      • PR feat: enable swapper selection #4159

This comment was auto-generated by Graphite.

[gomesalexandre]

See review from shapeshift/lib#1230, pre-stamp, will stamp this as soon as the lib PR gets in

[gomesalexandre]

Sanity retested this after bumping the swapper dep, confirmed I wasn't able to see negative amounts for CoW (and miner fees are properly displayed for ZRX/Thor)