performance idea: rewrite to "set iterator with while" or back to Array

[betula]

  run = (unsubs) => (
    // can unsubs be modified in run functions?
    unsubs.forEach(fn => fn()), // performance problem here (for of more quick)
    unsubs.clear()
  ),

"for of" perf problem

And return "detach" function no have a reason in most cases:

  attach = (unsubs, fn) => (
    (fn || (fn = unsubs, unsubs = context_unsubs)), <---------- remove "||" performance reason
    unsubs && unsubs.add(fn),
    () => unsubs.delete(fn) // <--------------- remove it performance and size reason
  ),

It should be super small and super fast!

p.s.
May be rewrite back to Array from Set.
May be remove "unsubscriber" function (it's so long name) and type in documentation what it is an array.

[betula]

node.js:
for of array        60.82   56.2 	  54.75 	54.65 	53.88 	54.93 	55.02 	54.89 	53.83 	55.12
array.forEach       62      55.68 	54.27 	54.64 	55.37 	55.1 	  54.24 	55.04 	55.68 	54.69
for of set          56.1    54.94 	56.14 	55.66 	54.65 	55.15 	55.7 	  55.78 	54.72 	55.42
set.forEach         152.21 	150.54 	148.34 	148.64 	150.01 	149.59 	148.88 	148.59 	149.59 	149.52
for with len        54.54 	53.81 	54.9 	  55.04 	53.62 	54.18 	55.01 	54.69 	53.71 	54.11
for                 55.78 	54.82 	53.97 	54.1 	  55.05 	55.17 	53.94 	54.16 	55.13 	55.44
set iterator while  60.01 	58.52 	59.45 	59.54 	58.48 	58.33 	59.46 	59.7 	  58.67 	58.43

bun:
for of array        51.15 	41.57 	42.46 	42.7 	  42.02 	41.88 	43.15 	41.8 	  41.45 	41.39
array.forEach       39.03 	35.45 	34.47 	35.14 	34.35 	35.01 	34.24 	34.33 	34.34 	34.2
for of set          50.38 	46.1 	  45.83 	48.84 	45.58 	46.97 	46.97 	47.25 	49.89 	46.47
set.forEach         40.89 	35.84 	33.92 	33.65 	32.99 	32.81 	33.3 	  32.8 	  32.76 	32.77
for with len        26.53 	26.14 	26.51 	26.87 	26.17 	25.63 	25.66 	25.59 	25.69 	25.63
for                 27.42 	26.55 	26.07 	25.76 	25.67 	25.58 	25.61 	25.62 	25.61 	25.56
set iterator while  37.77 	35.27 	35.27 	35.19 	35.17 	35.17 	35.43 	36.24 	36.21 	36.41

https://github.com/re-js/evemin/blob/2544cecc6f1c7da98464b0179f870e3bc6e80810/perf_test.js#L6-L26