We have an example of a regression caused by a v8 fast api addition. I 
think it's worth investigating: https://github.com/nodejs/node/pull/58080

On a singular case, text-encoder performance is decreased by 8.5%.

util/text-encoder.js op='encodeInto' type='ascii' n=1000000 len=32          
          ***     -8.50 %       ±2.68% ±3.57% ±4.64% 

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