perl

improve debug-printing #3291

Job	Run time
notify	27s
ci (ubuntu-latest, 5.10)	2m 13s
ci-ubuntu-containers (centos:centos7)	4m 54s
cygwin	0s
ci (5.30, ubuntu-latest, true, true)	3m 44s
ci (5.30, ubuntu-latest, true)	6m 6s
ci (5.30, ubuntu-latest, 1)	3m 18s
ci (5.30, ubuntu-latest, true)	3m 18s
ci (5.30, ubuntu-latest, true)	2m 52s
ci (5.30, ubuntu-latest, true)	3m 16s
ci (5.26, windows-latest)	8m 7s
ci (5.30, macos-latest)	9m 29s
build-status	23s
	48m 7s

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