Hope to increase the resolution of conflicts that replaceOp at the same time

[Qquanwei]

doc

{
  startTime: 1
}

when A and B both submit op with replaceOp(['startTime'], 2) and replaceOp(['startTime'], 3) will conflict and throw error.

but can we add extra infomation to resolve this problem ? example we add a 'timestamp' or random number

op object

['startTime', { r: 2, weight: Date.now() }]
['startTime', { r: 3, weight: Date.now() }]

This can keeps the two operations consistent。we only simple compare weight to compose two operation.