F Prime GDS - Commanding locks up when resending a command from the history.

[timcanham]

F´ Version	v3.4.1, commit 8a1612c
Affected Component	n/a

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Problem Description

When trying to resend a command with a numerical argument from the history, the command send button no longer functions. Looking at the dev console, the following error is sent:

TypeError: argument.value.startsWith is not a function
    squashify_argument http://127.0.0.1:5000/addons/commanding/arguments.js:123
    serialize_arg http://127.0.0.1:5000/addons/commanding/command-input.js:56
    sendCommand http://127.0.0.1:5000/addons/commanding/command-input.js:161

Opening a new connection in another tab clears the problem, but only until a command with a numerical argument is resent from the history again.

How to Reproduce

1. Find a command with a numerical argument
2. Send the command
3. Double click on the command from the history and see the behavior

Expected Behavior

User should be able to always send a command from the history.