Running Linux 2.4.2-2 with 5.6.0, 5.6.1 and 5.7.3 I get this ouput

No eval        :1
In str eval    :1
In block eval  :1
Block Eval ret :1
Str Eval ret   :0
[download]

But adding brackets in Str Eval ret I get the expected results

# added parentheses like so
# print "Str Eval ret  :",readonly(eval('capture(5)')->[0]);

No eval        :1
In str eval    :1
In block eval  :1
Block Eval ret :1
Str Eval ret   :1
[download]

And finally using demerphq's updated code here I get

No eval        :1
In str eval    :1
In block eval  :1
Block Eval ret :1
Str Eval ret   :1
Str Eval ret2  :1
[download]

HTH

_________
broquaint