Odd number of vCPUs causes invalid array length in tinypool

[englishtom]

Describe the bug

When running Histoire in a containerised environment (Docker etc) which has been configured with an odd number of cpus e.g 3, 5, 7, 9 Histoire calculates the number of threads to use as a double e.g 1.5, 2.5, 3.5, 4.5.

This double is then passed to Tinypool which attempts to initialise an array using the double e.g. new Array(1.5) which causes an error.

I will submit a PR which changes the way that Histoire calculates the number of threads using Math.floor to ensure the final result is an integer.

Reproduction

I'm unable to provide a reproduction as I'm not able to configure the number of vCPUs on StackBlitz, however, I believe my description is sufficient to understand the issue.

System Info

System:
    OS: Linux 5.10 Debian GNU/Linux 10 (buster) 10 (buster)
    CPU: (5) x64 Intel(R) Core(TM) i5-9600K CPU @ 3.70GHz
    Memory: 2.73 GB / 3.84 GB
    Container: Yes
    Shell: 5.0.3 - /bin/bash
  Binaries:
    Node: 16.19.1 - /usr/local/bin/node
    Yarn: 1.22.19 - /usr/local/bin/yarn
    npm: 8.19.3 - /usr/local/bin/npm
  npmPackages:
    @histoire/plugin-svelte: ^0.15.8 => 0.15.8 
    histoire: ^0.15.8 => 0.15.8 
    vite: ^4.0.0 => 4.1.3

Used Package Manager

npm

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.