If an identical type to type is in type.stringtable, return the latter one. Otherwise, add it to type.stringtable. Some types don't get merged and are returned as-is.
Type to check against existing types
the type that was merged
The D Programming Language's Unofficial Docs
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If an identical type to type is in type.stringtable, return the latter one. Otherwise, add it to type.stringtable. Some types don't get merged and are returned as-is.