Optimize imports, function comments, logic judgments, and return values

[pemako]

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• Does not have any user-facing changes. This may include API changes, behavior changes, performance improvements, etc.

[pemako]

• CHANGE:

1. if condition

// old code
if value == false {}
// change to
if !value {}

2. return bool value

// old code
if !ok {
	return false
}
return true
// change to
return ok

// old code
if a == b {
	return true
}
return false
// change to
return a == b