JULIA_HEAP_SIZE_HINT ignored when provided via exported env variable

[alior101]

On Julia 1.11.1

(base) lior@lap1969:~$ export JULIA_HEAP_SIZE_HINT="300M"
(base) lior@lap1969:~$ julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.11.1 (2024-10-16)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> @show Base.JLOptions().heap_size_hint
(Base.JLOptions()).heap_size_hint = 0x0000000000000000
0x0000000000000000

julia> 

It works fine when given as --heap-size-hint ..

[giordano]

That's not particularly surprising since #55631 was merged 3 weeks ago and Julia v1.11.1 was released one month ago, besides the fact the feature freeze for the v1.11 series was almost one year ago and new features aren't typically backported. The variable will be available in Julia v1.12.