Pound traders are more optimistic -- or worried -- than ever before that a Brexit deal is possible, based on derivatives pricing.

Options show investors are the most bullish on the U.K. currency on a one-month basis that they’ve been since Bloomberg began compiling the data in 2003. The upswing follows Thursday’s positive meeting between U.K. Prime Minister Boris Johnson and Irish Premier Leo Varadkar.

Risk reversals, a barometer of market sentiment and positioning, surged for options that benefit from a stronger sterling after Varadkar said he believed an agreement is possible by the Oct. 31 deadline.

The pound rose by the most in seven months as traders unwound bets that sterling would weaken.

On longer tenors, investors remain more cautious. While demand for options that look for a weaker pound has waned, the market is still biased in favor of downside protection.