Ctrl-Backspace on empty line affects next letter typed

• I am on the latest Hyper.app version
• I have searched the issues of this repo and believe that this is not a duplicate

• OS version and name: Windows 10 Pro 1809 (using WSL Ubuntu 18.04)
• Hyper.app version: 3.0.0 (stable)
• Link of a Gist with the contents of your .hyper.js: https://gist.github.com/lpulley/06e1d65694e828c1241885e9abd6d3f7
• Relevant information from devtools (CMD+ALT+I on macOS, CTRL+SHIFT+I elsewhere): N/A
• The issue is reproducible in vanilla Hyper.app: Only hyper-dracula for theming. No functional plugins.

Issue

When Ctrl-Backspaceing a command, if I press Ctrl-Backspace at the beginning of the line (with no text on the prompt, e.g. user@host$ , nothing happens (as expected) but either the next character I type is ignored, or the word I just erased is submitted. For example, if on a blank prompt I type "l s Ctrl-Backspace Ctrl-Backspace l", it's as if I pressed "l s Enter". And if I type "o o o Ctrl-Backspace Ctrl-Backspace o o", only one "o" appears on the prompt, and the first is ignored.

No source file or test is named in the issue. Reproduce the Ctrl-Backspace sequence in Hyper on Windows 10 with WSL Ubuntu, then trace the terminal input handling; done when repeated Ctrl-Backspace presses on an empty prompt neither submit erased text nor discard the next character.