[Bug]: app.toml file with literal string for osmosis-mempool.arbitrage-min-gas-fee gets broken on startup

[sigv]

What happened?

The default app.toml file is generated with double-quotes for strings. However, we have tooling that rewrites the TOML file. We have the strings as single-quote literal.

This presents an issue with mempool configuration in app.toml. We have configuration:

[osmosis-mempool]
arbitrage-min-gas-fee = '.005'

When we start running the chain, this is overwritten to:

[osmosis-mempool]
0.1
arbitrage-min-gas-fee = '.005'

As result, next time Osmosis is restarted, app.toml file cannot be parsed and we encounter a failure.

Osmosis Version

24.0.0

How to reproduce?

Replace all double-quotes with single-quotes for app.toml, and start Osmosis chain binary:

[osmosis-mempool]
arbitrage-min-gas-fee = '.005'

[sigv]

Mitigation is possible by applying --reject-config-defaults flag to binary.

[sigv]

Resolved via #8118.