What is the legal implication of using the diminutive form when stating debt, such as 'I owe him a small dirham'?

Primary text

Stating a debt using the diminutive form, such as 'I owe him a small dirham' (lahu 'alayya durayhim), is treated the same as stating the singular form, 'a dirham.' The use of the diminutive may indicate the smallness of the item in itself, a lack of value in the speaker's estimation, or it may signify affection, as exemplified by the poet's usage.