ولو قال أعطني نصف درهم فلوسا ونصفا إلا حبة جاز البيع
Translation: If he instead says, 'Give me half a dirham's worth of fulus and silver weighing a half-dirham minus one grain,' the exchange is valid.
The speaker has not preassigned half of the original dirham to each component. Rather, he requests a known amount of fulus and a slightly smaller silver piece together.
This wording allows an allocation that preserves equality within the silver-to-silver part.
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Second formulation: a small wording change
Bab al-Sarf: Circulating Fulus, Obsolete Coins and Money-Changer Exchanges
ولو قال أعطني نصف درهم فلوسا ونصفا إلا حبة جاز البيع
Translation: If he instead says, 'Give me half a dirham's worth of fulus and silver weighing a half-dirham minus one grain,' the exchange is valid.
The speaker has not preassigned half of the original dirham to each component. Rather, he requests a known amount of fulus and a slightly smaller silver piece together.
This wording allows an allocation that preserves equality within the silver-to-silver part.