he/him 
Hot take: JavaScript transpiled features should be as spec compliant as possible, even if it ends up being 10x slower. Ship the slow output to older browsers. Using spec incompliant transforms limits your ability to turn them off safely later.
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Isn’t one of the main reasons for a transpilation that the spec hasn’t settled yet? Seems like a chicken and egg situation.
For experimental features, sure. However 90% of the syntax people use is standardised and will not change.
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How common is it that the syntax stay the same but the semantic ends up different? Why would someone use a different API in cases where the API is already standardized and the intended semantic is the same?
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