Thanks Jakob1
I found out after I sent the original message that performance.now is
constrained to 5µs resolution anyway for security reasons, but it's good to
know about the implementation.
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Some sort of rounding error, yes. The internal representation (before
converting the value to float) is microseconds. Actual precision depends on
the operating system, as the comment in time.h says:
// Returns a platform-dependent high-resolution tick count. Implementation
> // is hardware
