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perldelta for save source lines as PVIV instead of as PVMG

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Original file line number	Diff line number	Diff line change
`@@ -377,6 +377,14 @@ manager will later use a regex to expand these into links.`
`377`	`377`	`In some cases an C<eval> would not add integer parts to the source`
`378`	`378`	`lines saved by the debugger. [GH #23151]`
`379`	`379`
	`380`	`+=item *`
	`381`	`+`
	`382`	`+Save debugger lines as C<PVIV> SVs rather than as C<PVMG> SVs as they`
	`383`	`+don't need magic, aren't blessed and don't need to store a floating`
	`384`	`+point part. This should save 24 bytes per stored line for 64-bit`
	`385`	`+systems, more for C<-Duselongdouble> or C<-Dusequadmath> builds.`
	`386`	`+Discussed in [GH #23171].`
	`387`	`+`
`380`	`388`	`=back`
`381`	`389`
`382`	`390`	`=head1 Known Problems`

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