When should debt reset to zero?

[smol-ninja]

In the current design, the following functions reset the debt to zero by updating lastTimeUpdate to block.timestamp through _updateTime() function:

• adjustRatePerSecond
• restartStream

Problems with this approach:

• Imagine an employer wants to cancel the stream as he does not want to continue to accumulate debt anymore. But after one month, he then decides to restart it. Now this will reset the debt.
• A company increases the salary of an employee which means changing rps but doesn't have funds to pay the debt.

The following function does not reset the debt:

• cancel

Future functions that would reset the debt:

• void
• payDebtAndCancelStream

It brings up a very interesting question: what functions should be allowed to reset the debt value to 0 if accumulated over a period of time?

Related discussions:

• Changing `ratePerSecond` resets Debt #60
• What happens with debt when a stream is canceled? #58
• Voiding streams with negative debt for improved accounting #57
• Why are there no NFT-s? #34

[smol-ninja]

Its duplicate of #86 Should we carry forward the debt after the stream has been paused?.