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Maximum map entry key size

Publishing items using the data structure containerType="MAP" what is the maximum allowable size for a mapEntry key value?

elektronelektron-sdkrrteta-apielektron-transport-apimap-entry
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From my test with UPA 8.0.0.L1, if the keyPrimitiveType is a buffer or string, the maximum length of the key buffer is 32767 bytes.

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