Stage 1

• introduced to TC39
• champions identified (@jamiebuilds && @hemanth)
• initial explainer (Explainer)

Stage 2

• committee approval
• spec text written
• spec reviewers selected (@gibson042, @ljharb)

Stage 3

• committee approval
• spec editor sign off
• spec reviewer sign off
• received developer/implementer feedback

Stage 4

• committee approval
• implemented in two browsers
• write test262 tests
• merge test262 tests
• prepare ecma262 pr
• editor-approved ecma262 pr