[FLOSS] Toml plugin fails silently on meta-set

[Bujuhu]

As discussed in #4555, the toml storage plugin fails silently, when setting unknown meta keys

Steps to Reproduce the Problem

$ sudo kdb mount test.toml user:/tests/storage/types toml type
# RET: 0
$ kdb meta-set user:/tests/storage/types blue blah 
# RET: 0  
$ kdb meta-get user:/tests/storage/types blue  
Key not found
# RET: 2

Expected Result

Should either print an error on kdb meta-set user:/tests/storage/types blue blah and return a non 0 exit code or
kdb meta-get user:/tests/storage/types blue should return blah

Actual Result

kdb meta-set user:/tests/storage/types blue blah fails silently and kdb meta-get user:/tests/storage/types blue returns an key not found error

System Information

Operating System:
Arch Linux, Kernel 5.19.13-arch1-1

kdb and plugins version

# kdb --version
KDB_VERSION: 0.9.11
SO_VERSION: 5

Relevant Source Code

This happens because both the type and toml plugins only look for meta keys if they are of use for said plugins. If not, they are simply ignored.

libelektra/src/plugins/type/type.c

Line 372 in cf4b6f3

const Key * orig = keyGetMeta (cur, "origvalue");

libelektra/src/plugins/type/type.c

Line 65 in cf4b6f3

static const char * getTypeName (const Key * key)

libelektra/src/plugins/toml/prepare.c

Line 263 in cf4b6f3

return keyGetMeta (key, "order") == NULL && !isArrayIndex (keyBaseName (key));

libelektra/src/plugins/toml/prepare.c

Line 167 in cf4b6f3

const Key * meta = keyGetMeta (key, "array");