Re^3: Any reason NV is not marked as POK when accessed as string?

... makes me think maybe we used to trust the cached value

I think https://www.nntp.perl.org/group/perl.perl5.porters/2016/10/msg240576.html and responses is relevant here.
As also mentioned there, the stringification of the NV is retained if the NV is an inf or nan.
I assumed this was ok because stringifications of inf and nan were not affected by locale. (But I notice that stringification of 0.0 to "0" is not retained.)

Cheers,
Rob

Comment on Re^3: Any reason NV is not marked as POK when accessed as string?

Replies are listed 'Best First'.
Re^4: Any reason NV is not marked as POK when accessed as string? by demerphq (Chancellor) on Mar 23, 2017 at 23:23 UTC
It is not very consistent. Consider: `$ perl -MDevel::Peek -e'$x="1e1"; 0+$x; Dump($x)' SV = PVNV(0xc27550) at 0xc48bc8 REFCNT = 1 FLAGS = (IOK,NOK,POK,pIOK,pNOK,pPOK) IV = 10 NV = 10 PV = 0xc37d80 "1e1"\0 CUR = 3 LEN = 16 $perl -MDevel::Peek -e'$x="1.1e1"; 0+$x; Dump($x)' SV = PVNV(0x1513550) at 0x1534bc8 REFCNT = 1 FLAGS = (IOK,NOK,POK,pIOK,pNOK,pPOK) IV = 11 NV = 11 PV = 0x1523d80 "1.1e1"\0 CUR = 5 LEN = 16` [download] Something smells here. I think that patch needs to be reviewed and supplanted. --- $world=~s/war/peace/g	[reply] [d/l]

Replies are listed 'Best First'.

Re^4: Any reason NV is not marked as POK when accessed as string?
by demerphq (Chancellor) on Mar 23, 2017 at 23:23 UTC

It is not very consistent. Consider:

$ perl -MDevel::Peek -e'$x="1e1"; 0+$x; Dump($x)'
SV = PVNV(0xc27550) at 0xc48bc8
  REFCNT = 1
  FLAGS = (IOK,NOK,POK,pIOK,pNOK,pPOK)
  IV = 10
  NV = 10
  PV = 0xc37d80 "1e1"\0
  CUR = 3
  LEN = 16
$perl -MDevel::Peek -e'$x="1.1e1"; 0+$x; Dump($x)'
SV = PVNV(0x1513550) at 0x1534bc8
  REFCNT = 1
  FLAGS = (IOK,NOK,POK,pIOK,pNOK,pPOK)
  IV = 11
  NV = 11
  PV = 0x1523d80 "1.1e1"\0
  CUR = 5
  LEN = 16
[download]

Something smells here. I think that patch needs to be reviewed and supplanted.

---
$world=~s/war/peace/g

[reply]
[d/l]