Comparator eq, gt, lt, gte, lte unary API

[richytong]

For use in functions like .some or .every

// some statuses are 200
statuses.some(eq(200)) // equivalent to statuses.some(eq(identity, 200))
some(statuses, eq(200))

// some statuses greater than 200
statuses.some(gt(200)) // equivalent to statuses.some(gt(identity, 200))
some(statuses, gt(200))

// some statuses less than 200
statuses.some(lt(200)) // equivalent to statuses.some(lt(identity, 200))
some(statuses, lt(200))

// some statuses greater than or equal to 200
statuses.some(gte(200)) // equivalent to statuses.some(gte(identity, 200))
some(statuses, gte(200))

// some statuses less than or equal to 200
statuses.some(lte(200)) // equivalent to statuses.some(lte(identity, 200))
some(statuses, lte(200))