Is the sale of goods by measure (kail) or weight (wazn) restricted to 'like for like' exchange regarding usury (riba)?

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Any commodity whose nature is measured by volume (kail) or weight (wazn) is subject to the prohibition of unequal exchange, even if exact measurement is impractical due to extreme smallness (like a seed or a handful) or largeness (like a massive lump). The exchange must be like for like, and disparity is forbidden. This is the position held by Al-Thawri, Al-Shafi'i, Ishaq, and Ibn al-Mundhir. The evidence for this is the Prophet's saying: "Dates for dates like for like, and wheat for wheat like for like; whoever increases or is increased has engaged in usury." Furthermore, what is subject to usury in large quantities is also subject to it in small quantities, analogous to weighed items.