⚡️ Faster initialization of globals by dropping `typeof` checks

[dubzzz]

Description

⚠️ Minor breaking change

In the past we used to checks for typeof Type when initializing our globals (the globals protecting fast-check from poisoning). It used to be done because some of them only appeared starting at Node >8. With our minimal target version being bumped to at least 10.5.0 we can safely stop having these checks and save some precious time during tests (for our users).

This change forces us to move minimal requirements to at least 10.5.0.

Checklist — Don't delete this checklist and make sure you do the following before opening the PR

• [x] The name of my PR follows gitmoji specification
• [x] My PR references one of several related issues (if any)
  • [x] New features or breaking changes must come with an associated Issue or Discussion
  • [x] My PR does not add any new dependency without an associated Issue or Discussion
• [x] My PR includes bumps details, please run yarn bump and flag the impacts properly
• [x] My PR adds relevant tests and they would have failed without my PR (when applicable)

Advanced

• [x] Category: ⚡️ Improve performance
• [x] Impacts: We have to run against Node 10.5.0+

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[github-actions[bot]]

👋 A preview of the new documentation is available at: http://66bb0da4a9b1dbd333f8c9f6--dubzzz-fast-check.netlify.app

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.59%. Comparing base (b6e23bc) to head (d52b0f4). Report is 3 commits behind head on next-3_21_0.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## next-3_21_0 #5212 +/- ## =============================================== - Coverage 94.60% 94.59% -0.01% =============================================== Files 229 228 -1 Lines 9285 9269 -16 Branches 2716 2694 -22 =============================================== - Hits 8784 8768 -16 Misses 501 501 ``` | [Flag](https://app.codecov.io/gh/dubzzz/fast-check/pull/5212/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nicolas+DUBIEN) | Coverage Δ | | |---|---|---| | [unit-tests](https://app.codecov.io/gh/dubzzz/fast-check/pull/5212/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nicolas+DUBIEN) | `94.59% <100.00%> (-0.01%)` | :arrow_down: | | [unit-tests-18.x-Linux](https://app.codecov.io/gh/dubzzz/fast-check/pull/5212/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nicolas+DUBIEN) | `94.59% <100.00%> (-0.01%)` | :arrow_down: | | [unit-tests-20.x-Linux](https://app.codecov.io/gh/dubzzz/fast-check/pull/5212/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nicolas+DUBIEN) | `94.59% <100.00%> (-0.01%)` | :arrow_down: | | [unit-tests-22.x-Linux](https://app.codecov.io/gh/dubzzz/fast-check/pull/5212/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nicolas+DUBIEN) | `94.59% <100.00%> (-0.01%)` | :arrow_down: | | [unit-tests-latest-Linux](https://app.codecov.io/gh/dubzzz/fast-check/pull/5212/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nicolas+DUBIEN) | `94.59% <100.00%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Nicolas+DUBIEN#carryforward-flags-in-the-pull-request-comment) to find out more.

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[github-actions[bot]]

👋 A preview of the new documentation is available at: http://66bb9c2294302c737244fa0a--dubzzz-fast-check.netlify.app

[dubzzz]

Could maybe be 10.4.0 instead of 10.5.0 for the minimal supported version of Node