Build

Avoid using `**` with `BigInt` #7901

Job	Run time
Build CJS (18)	3m 54s
Build CJS (16)	3m 18s
Build Docs (18)	8m 3s
Build Types (18)	1m 14s
Build ESM (18)	1m 14s
Build Types (16)	1m 16s
Build ESM (16)	1m 20s
Build Web	34s
End-to-End ganache:ws (18, electron)	16m 32s
End-to-End ganache:ws (18, chrome)	16m 58s
Integration IPC (18, geth, ipc)	9m 10s
End-to-End ganache:ws (18, firefox)	1m 25s
Integration (18, geth, http)	4m 15s
Integration IPC (16, geth, ipc)	9m 6s
End-to-End ganache:ws (16, electron)	12m 47s
Lint	5m 13s
End-to-End ganache:ws (16, chrome)	14m 6s
Integration (18, geth, ws)	7m 21s
End-to-End ganache:ws (16, firefox)	1m 37s
Integration (18, ganache, http)	3m 56s
Unit Tests (18)	3m 34s
Integration (18, ganache, ws)	6m 4s
Unit Tests (16)	3m 43s
Integration (16, geth, http)	5m 6s
Integration (16, geth, ws)	7m 13s
Integration (16, ganache, http)	3m 56s
Integration (16, ganache, ws)	4m 9s
	2h 37m 4s

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