A student might argue that dinars, wheat and garments all have sale prices. But market value and legal validity of an exception are separate questions.
Al-Quduri expressly allows deduction by value for a dinar or qafiz of wheat under the stated Hanafi rule; the commentary grounds that in a particular legal affinity. A garment does not qualify on the same basis. First determine whether the type of cross-kind exclusion is legally valid; only then calculate a value-based deduction. Arithmetic cannot validate an otherwise invalid exception.
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Why having a price is not enough
Kitab al-Iqrar: Connected Exceptions, Quantities, and Cross-Category Exceptions
A student might argue that dinars, wheat and garments all have sale prices. But market value and legal validity of an exception are separate questions.
Al-Quduri expressly allows deduction by value for a dinar or qafiz of wheat under the stated Hanafi rule; the commentary grounds that in a particular legal affinity. A garment does not qualify on the same basis. First determine whether the type of cross-kind exclusion is legally valid; only then calculate a value-based deduction. Arithmetic cannot validate an otherwise invalid exception.