Do not mutating global variables

[Jack-Works]

https://github.com/amark/gun/blob/5df08f91cb2959deb36c0f4f85c0e537ad103e0c/src/shim.js

The following are not in the JS standard:

• String.random
• String.match
• String.hash
• Object.plain
• Object.empty
• setTimeout.turn
• setTimeout.poll
• setTimeout.each

Please do not try to modify those objects but use them as internal utils, thanks!