Type alias explained
yourbasic.org/golang
An alias declaration has the form
type T1 = T2as opposed to a standard type definition
type T1 T2
An alias declaration doesn’t create a new distinct type different
from the type it’s created from.
It just introduces an alias name T1, an alternate spelling,
for the type denoted by T2.
Type aliases are not meant for everyday use. They were introduced to support gradual code repair while moving a type between packages during large-scale refactoring. Codebase Refactoring (with help from Go) covers this in detail.
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