No Rounded Corners - No Sharp Corners - Only a in between?

[ThaDaVos]

I'm currently writing a SVG parser which can convert SVG's to PNG's but I'm running into a few issues

ISSUE 1:
The corners of my rectangles aren't sharp but slightly rounded. Same counts for the other shapes. I expected them to be sharper than this. See followng images (Blue line at the bottom is element and haven't got it working yet!):
Generated

Original

https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Basic_Shapes

ISSUE 2/Feature Request:
As can be seen above, I haven't got the rounded corners working. Is this even possible?

[tocsoft]

can you please provide a some code for a minimal reproduce your issues so we can help trying to resolve the problem.

[ThaDaVos]

I've got a private repo, I'll add you as collaborator!