"A" works with characters since 5.10. (It still works with bytes, being a subset of characters.) 
>perl588\bin\perl -MTest::More=no_plan -e"$s=join '', map chr, 0x2660.
+.0x2666; is(unpack('A4',$s), substr($s,0,4))"
not ok 1
[...]
1..1
# Looks like you failed 1 test of 1.

>perl589\bin\perl -MTest::More=no_plan -e"$s=join '', map chr, 0x2660.
+.0x2666; is(unpack('A4',$s), substr($s,0,4))"
not ok 1
[...]
1..1
# Looks like you failed 1 test of 1.

>perl5100\bin\perl -MTest::More=no_plan -e"$s=join '', map chr, 0x2660
+..0x2666; is(unpack('A4',$s), substr($s,0,4))"
ok 1
1..1

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In reply to Re^2: Length of float using printf by ikegami
in thread Length of float using printf by vinaynp

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