This fragmentation hurts portability. Code that performs well on one runtime may behave differently (or poorly) on another, even though it's using "standard" APIs. The complexity burden on runtime implementers is substantial, and the subtle behavioral differences create friction for developers trying to write cross-runtime code, particularly those maintaining frameworks that must be able to run efficiently across many runtime environments.
Most userland implementations of custom ReadableStream instances do not typically bother with all the ceremony required to correctly implement both default and BYOB read support in a single stream – and for good reason. It's difficult to get right and most of the time consuming code is typically going to fallback on the default read path. The example below shows what a "correct" implementation would need to do. It's big, complex, and error prone, and not a level of complexity that the typical developer really wants to have to deal with:
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This story was originally featured on Fortune.com
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Might the linkage between “stuff of iron” and “surety to those that are in doubt,” likewise, have an ancient pedigree via gestural traditions? Notable here is the fact that one of the oldest known fairy tales involves iron-working: “The Smith and the Devil.” A study from 2013 concluded that this story template, which associates iron-working skill with magic, was traceable back at least 6,000 years.
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