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Array operators allow for checking if an array custom field does or does not contain specific values

Client SDKs

Array operators will work with all versions of all client SDKs except on device eval client SDKs. For on device eval SDKs below are the supported SDKs and minimum versions js-on-device-eval-client - v3.5.1

Server SDKs

Array operators require certain SDK versions to work in server SDKs Node.js - v5.27.0 Node Lite - v0.4.0 Python - v0.42.0 Ruby - v2.1.0 Java/Kotlin Server - v1.26.0 PHP - v3.5.0 Go - v1.31.0 (only supports type []interface) .Net Server - v2.1.0 All of the new Server Core SDKs support array operators in all versions