create slice with capacity, when capacity is known

[AdityaHarindar]

This reduces the number of allocations made to the underlying array, while append() attempts to 'grow' the slice beyond its initial capacity

[gopherbot]

This PR (HEAD: da3a7cb) has been imported to Gerrit for code review.

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[gopherbot]

Message from Bryan C. Mills:

Patch Set 1:

(2 comments)

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Please don’t reply on this GitHub thread. Visit golang.org/cl/203722.
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[gopherbot]

This PR (HEAD: d25b90c) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/playground/+/203722 to see it.

Tip: You can toggle comments from me using the comments slash command (e.g. /comments off)
See the Wiki page for more info

[gopherbot]

Message from aditya harindar:

Patch Set 1:

(2 comments)

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Please don’t reply on this GitHub thread. Visit golang.org/cl/203722.
After addressing review feedback, remember to publish your drafts!

[gopherbot]

Message from Bryan C. Mills:

Patch Set 2:

(2 comments)

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After addressing review feedback, remember to publish your drafts!

[gopherbot]

Message from aditya harindar:

Patch Set 3:

(2 comments)

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[gopherbot]

Message from Bryan C. Mills:

Patch Set 4:

(2 comments)

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Please don’t reply on this GitHub thread. Visit golang.org/cl/203722.
After addressing review feedback, remember to publish your drafts!