http://www.perlmonks.org?node_id=734519

belg4mit has asked for the wisdom of the Perl Monks concerning the following question:

Hi all, I've got some code that I'm trying to make usable with as many user setups as possible, and I've run into an odd problem. The first code block below does what it ought (uppercase $_) in 5.005_04, 5.6.0, 5.8.4, 5.8.5 and 5.8.10, but in 5.6.1 and 5.6.2 it turns 'Hello World' into
H
W
The second, largely identical, code block works fine in 5.6.[12], but that doesn't really explain why things have gone awry.
tr/a-z\x{fff03}-\x{fff05}\x{e0}-\x{f6}\x{f8}-\x{fe}\x{ff}\x{103}\x{105 +}\x{107}\x{109}\x{10b}\x{10d}\x{10f}\x{103}\x{105}\x{117}\x{119}\x{11 +b}\x{11d}\x{11f}\x{103}\x{105}\x{127}\x{129}\x{12b}\x{12d}\x{12f}\x{1 +33}\x{135}\x{137}\x{13a}\x{13c}\x{13e}\x{140}\x{142}\x{144}\x{146}\x{ +148}\x{14b}\x{14d}\x{14f}\x{151}\x{153}\x{155}\x{157}\x{159}\x{15b}\x +{15d}\x{15f}\x{161}\x{163}\x{165}\x{167}\x{169}\x{16b}\x{16d}\x{16f}\ +x{171}\x{173}\x{175}\x{177}\x{17a}\x{17c}\x{17e}/A-Z\x{fff00}-\x{fff0 +2}\x{c0}-\x{d6}\x{d8}-\x{de}\x{178}\x{102}\x{104}\x{106}\x{108}\x{10a +}\x{10c}\x{10e}\x{102}\x{104}\x{116}\x{118}\x{11a}\x{11c}\x{11e}\x{10 +2}\x{104}\x{126}\x{128}\x{12a}\x{12c}\x{12e}\x{132}\x{134}\x{136}\x{1 +39}\x{13b}\x{13d}\x{13f}\x{141}\x{143}\x{145}\x{147}\x{14a}\x{14c}\x{ +14e}\x{150}\x{152}\x{154}\x{156}\x{158}\x{15a}\x{15c}\x{15e}\x{160}\x +{162}\x{164}\x{166}\x{168}\x{16a}\x{16c}\x{16e}\x{170}\x{172}\x{174}\ +x{176}\x{179}\x{17b}\x{17d}/;
tr/a-z/A-Z/;tr/\x{fff03}-\x{fff05}\x{e0}-\x{f6}\x{f8}-\x{fe}\x{ff}\x{1 +03}\x{105}\x{107}\x{109}\x{10b}\x{10d}\x{10f}\x{103}\x{105}\x{117}\x{ +119}\x{11b}\x{11d}\x{11f}\x{103}\x{105}\x{127}\x{129}\x{12b}\x{12d}\x +{12f}\x{133}\x{135}\x{137}\x{13a}\x{13c}\x{13e}\x{140}\x{142}\x{144}\ +x{146}\x{148}\x{14b}\x{14d}\x{14f}\x{151}\x{153}\x{155}\x{157}\x{159} +\x{15b}\x{15d}\x{15f}\x{161}\x{163}\x{165}\x{167}\x{169}\x{16b}\x{16d +}\x{16f}\x{171}\x{173}\x{175}\x{177}\x{17a}\x{17c}\x{17e}/\x{fff00}-\ +x{fff02}\x{c0}-\x{d6}\x{d8}-\x{de}\x{178}\x{102}\x{104}\x{106}\x{108} +\x{10a}\x{10c}\x{10e}\x{102}\x{104}\x{116}\x{118}\x{11a}\x{11c}\x{11e +}\x{102}\x{104}\x{126}\x{128}\x{12a}\x{12c}\x{12e}\x{132}\x{134}\x{13 +6}\x{139}\x{13b}\x{13d}\x{13f}\x{141}\x{143}\x{145}\x{147}\x{14a}\x{1 +4c}\x{14e}\x{150}\x{152}\x{154}\x{156}\x{158}\x{15a}\x{15c}\x{15e}\x{ +160}\x{162}\x{164}\x{166}\x{168}\x{16a}\x{16c}\x{16e}\x{170}\x{172}\x +{174}\x{176}\x{179}\x{17b}\x{17d}/;
The problem actually seems to persist with any subset of the hex translations in parallel with the ASCII e.g;
tr/a-z\x{fff03}-\x{fff05}/A-Z\x{fff00}-\x{fff02}/;

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