fix flex

[jeetiss]

fix #1332

changes:

• tests
• convert flex to string before split
• use flex defaults instead of value as fallback

[staevs]

suppose types (interface Style) should be updated as well in types/style.d.ts line 7 from flex?: number to flex?: string

[jeetiss]

@staevs thanks for review, typed updated already
https://github.com/diegomura/react-pdf/blob/master/packages/types/style.d.ts#L7

[staevs]

yep, now I see it in main repo, but were they published already as after installing version 2.0.2 (@react-pdf/types) I still have definition flex?: number?

[diegomura]

Thanks!! Will deploy a new version later today

[leandrovegacr]

Just run into this issue today, I was so puzzled. Great to see you got it covered, thank you!