Book on Lipschitz pointwise constant

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Does anyone know of a book (or possibly an accessible paper) discussing Lipschitz pointwise constants and perhaps including some examples? Thank you

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Pretty much anything under the heading of analysis on metric spaces will deal with this thing, since it is a substitute for $|\nabla u|$ in metric space setting. Specifically, I recommend

The above are reasonably accessible sources, and it is advisable to read them before proceeding to more specialized literature on "Lip-lip" properties, etc (Gong, Keith, Schioppa...)