@sprintf %g precision is sometimes not honored

[bjarthur]

julia> x=9.98402083170343e-31
9.98402083170343e-31

julia> @sprintf("%0.1g", x)
"1e-30"

julia> @sprintf("%0.2g", x)              ### not correct
"9.999999999999999e-31"

julia> @sprintf("%0.3g", x)
"9.98e-31"

julia> @sprintf("%0.4g", x)
"9.984e-31"

[bicycle1885]

I cannot reproduce it on the latest master branch and on Julia 1.6.2. Which Julia version did you use?

julia> using Printf

julia> x=9.98402083170343e-31
9.98402083170343e-31

julia> @sprintf("%0.1g", x)
"1e-30"

julia> @sprintf("%0.2g", x)              ### not correct
"1e-30"

julia> @sprintf("%0.3g", x)
"9.98e-31"

julia> @sprintf("%0.4g", x)
"9.984e-31"

julia> versioninfo()
Julia Version 1.8.0-DEV.310
Commit cb30aa7a08* (2021-08-06 03:11 UTC)
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: AMD Ryzen 9 3950X 16-Core Processor
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, znver2)
Environment:
  JULIA_PROJECT = @.

[aramirezreyes]

I can reproduce with v1.6.0 in macOS

but not in today's master.

Can it be related to #40689?

[bjarthur]

my bad, i was using 1.6.1 and should've checked a more recent version. sorry. WFM on 1.7-beta3