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Simplified "cracking" is too general a term to determine if it's ok or not.
Orientation, width, reason for cracking, are all things that really should be considered - generally contractors/concrete guys do the placing and finishing, and may not be entirely knowledgeable. What you really should look into is a structural engineer or a concrete specialist.
I work in the industry, and the effects of cracking range from cosmetic nuisance to downright dangerous.
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