The book distinguishes recognized, established readings from shādhdh (non-canonical) readings. The key difference is the status of transmission, not simply how familiar a sound is to a local audience.
A learner should not dismiss every unfamiliar recitation as an error before checking which attested reading tradition it represents.
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Conclusion: Tajwīd, Waqf, ʿUthmānic Rasm and Qirāʾāt
The book distinguishes recognized, established readings from shādhdh (non-canonical) readings. The key difference is the status of transmission, not simply how familiar a sound is to a local audience.
A learner should not dismiss every unfamiliar recitation as an error before checking which attested reading tradition it represents.