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add bigNumbers, and restrict the Max under maxInt64.
-rw-r--r-- 74 .babelrc
-rw-r--r-- 70 .gitignore
drwxr-xr-x - contracts
-rw-r--r-- 341515 package-lock.json
-rw-r--r-- 1131 package.json
drwxr-xr-x - src