Implement node.js buffer.isAscii|isUtf8 #2281
Merged
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This change adds two new methods to the node.js Buffer class: isAscii and isUtf8. These methods are used to check if the buffer contains only ASCII or UTF-8 characters, respectively.
The implementation of these methods is based on the simdutf library, just like in Node.js itself. (the dependency will be used for other things too... this is just the first thing)