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Fix excessive memory allocation from crafted container headers #556

Job	Run time
valgrind	5m 50s
other (ubuntu, truffleruby)	1m 33s
other (ubuntu, jruby-9.4)	44s
head-versions (ubuntu, jruby-head)	1m 10s
mri (windows-latest, 3.2)	2m 28s
head-versions (ubuntu, ruby-head)	1m 12s
mri (ubuntu-latest, 2.6)	30s
mri (ubuntu-latest, 3.2)	41s
mri (ubuntu-latest, 2.7)	50s
mri (ubuntu-latest, 2.5)	27s
mri (ubuntu-latest, 3.4)	41s
mri (macos-latest, 3.2)	47s
mri (ubuntu-latest, 3.0)	39s
mri (ubuntu-latest, 3.1)	46s
mri (ubuntu-latest, 3.5)	39s
mri (ubuntu-latest, 3.3)	45s
mri (windows-latest, 2.5)	2m 45s
mri (ubuntu-latest, 4.0)	40s
mri (macos-latest, 2.6)	47s
	23m 54s