<=>

        # Gem::Source::Lock.<=>

(from ruby core)
### Implementation from Source
---
    <=>(other)

---

Sources are ordered by installation preference.


(from ruby core)
### Implementation from Object
---
    obj <=> other -> 0 or nil

---

Returns 0 if `obj` and `other` are the same object or `obj == other`,
otherwise nil.

The #<=> is used by various methods to compare objects, for example
Enumerable#sort, Enumerable#max etc.

Your implementation of #<=> should return one of the following values:
-1, 0, 1 or nil. -1 means self is smaller than other. 0 means self is
equal to other. 1 means self is bigger than other. Nil means the two
values could not be compared.

When you define #<=>, you can include Comparable to gain the methods
#<=, #<, #==, #>=, #> and #between?.